define double fertilisation in breif with example ??
Answers
Double fertilization refers to the situation in which a sperm is fused with the egg to form the embryo and another sperm combines with the polar nucleus to yield the endosperm.
The term double fertilization applies mostly to the angiosperms. The angiosperms are those flowering plants in which their seed is enclosed within a carpel.Hence, the term double fertilization refers to the situation in which a sperm is fused with the egg to form the embryo and another sperm combines with the polar nucleus to yield the endosperm.
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true/false Plants carry out cellular respiration
Answers
Answer:
True
Explanation:
Which of the following statements is true about the diagram below A. H+ ions are moving into the cell by facilitated diffusion B. The concentration of H+ ions is increasing inside the cell C. H+ ions are moving out of the cell by active transport D. The H+ ions are moving down the concentration gradient
Answers
\(H^+\) ions are moving out of the cell by active transport. Option C.
What is active transport?Active transport is a form of cell transportation that requires the expedition of energy, usually in the form of ATP.
An example of active transport is ion transport across the cell membrane as depicted in the image. When materials are moved from the side of higher concentration to the side of lower concentration, the materials are moved along their concentration gradients.
When materials move from the side of a lower concentration to the side of a higher concentration, the materials are said to be moved against their concentration gradients.
From the image, one can see that \(H^+\) ions are moving from the cytoplasm across the cell membrane to the external environment. It can also be seen that this movement of ions requires ATP. Thus, it can be concluded that \(H^+\) ions are moving out of the cell by active transport.
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Since a pump carrier protein is carrying H+ from the lower-concentration side to the higher-concentration side using ATP, we can assume the true statement about the diagram is C) H+ ions are moving out of the cell by active transport.
What is active transport?Active transport is a cellular transmembrane type of transport together with passive transport and simple diffusion.
Active transport acts against the electrochemical gradient, so it does need energy to transport substances. It carries molecules from a low-concentration side of the membrane to a high-concentration side.
The energy used comes from ATP (Na-K bomb) or the membrane's electric potential.
The transmembrane proteins involved in active transport are Carrier proteins.
In the exposed image you can see
A higher concentration of H+ in the extracellular space.H+ being pumped against their electrochemical gradient (from the lower concentration side to the higher concentration side)ATP is mediating this transportA H+ pump is carrying H+.This is active transport. Option C.
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The ureters extend downward __________ the parietal peritoneum on the posterior abdominal wall and join the urinary bladder from __________.
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On the posterior abdominal wall, the ureters extend downward behind the parietal peritoneum and join the urinary bladder from below. The urinary bladder functions as a temporary storage space for urine. It is located under the parietal peritoneum and posterior to the pubic symphysis in the pelvic cavity. The shape and size of the urinary bladder changes based on the amount of urine it carries and the amount of pressure it receives from other organs.
How are ureters connected to the urinary bladder?
The tubes termed as ureters are responsible for transporting urine from the kidneys to the bladder. The ureters and bladder are connected by microscopic openings known as ureteric orifices. On each side of the spine, right below the ribs, are the kidneys, which filter the blood and generate urine. Each kidney's ureter, which carries urine, empties into a storage region in front of the bladder.
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tarsiers have an unusual mix of anatomical features. describe at least one anatomical trait that is unique to rarsiers
Answers
Tarsiers have several unique anatomical traits that set them apart from other primates. One such feature is their huge eyes, which are the largest relative to body size of any mammal.
These enormous eyes give tarsiers exceptional visual acuity and allow them to hunt insects in complete darkness. Additionally, tarsiers have an elongated tarsal bone in their ankle, which gives them the ability to leap up to 40 times their body length. This anatomical adaptation is crucial for their survival in their forest habitats, where they must quickly move between branches to avoid predators and catch prey.
Another unique anatomical trait of tarsiers is their dental formula, which differs from that of other primates. Tarsiers have fewer teeth than most primates, with only two incisors and one premolar on each side of their jaw, which are adapted for catching and eating insects. Overall, tarsiers' unique anatomical features allow them to thrive in their specialized arboreal habitats and make them one of the most distinctive and fascinating primates in the world.
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which change would lead to higher carbon dioxide levels in the atmosphere
A. An increase in photosynthesis
B. An decrease in animal
C. An increase in the burning of fossil fuels
D. An decrease in the destruction of forests
Answers
An increase in the levels of fossil fuels results in higher carbon dioxide levels in the atmosphere. So the correct option is C.
What are fossil fuels?The components of fossil fuels are decaying plants and animals. These fuels may be burnt to provide energy and can be found in the crust of the Earth. An example of fossil fuel is coal, as well as oil and natural gas.
Coal is a substance that is typically found in sedimentary rock formations, which are collections of rock, dead plant and animal materials, and layers of silt. A chunk of coal must contain more than 50% fossilized plant material.
Shale is one sedimentary rock type that contains oil in its native form. The thick oil that may be used to generate gasoline is created by heating this substance. Typically, pockets of natural gas can be found atop oil deposits. Additionally, sedimentary rock strata devoid of oil might contain it. Methane is the main component of natural gas.
Therefore, an increase in the burning of fossil fuels will result in higher carbon dioxide levels in the atmosphere. So the correct option is C.
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Choose appropriate words to complete the paragraph below to explain the general trends shown in a predator-prey graph.
Breathe, Muscles, Oxygen, Lactic, anaerobic respiration, Oxygen aerobic respiration, Break down
An increase in the prey population provides more food for the _________ , allowing more to survive and _________ . This is turn results in an _________ in the predator population. The larger predator population eats more prey organisms, causing a _________ in the prey population. The death rate of the prey is larger than its _________ rate. The reduced prey population can no longer support the large predator population. _________ for food increases, resulting in a _________ in the size of the predator population. Reduced predator numbers results in less of the prey population being killed. More prey _________ and reproduce so the prey population _________ again.
Answers
Answer:
.....................
True or False: Only one species may be affected by human activity.
PLZZ HELP WILL BRAINLIST IF CORRECT!
Answers
Answer:
False
Explanation:
Many species may be affected by human activity in several ways such as pollution, hunting, overfishing, etc.
what is PM 2.5 and how does it affect people?
Answers
(For biochemistry)
Definition of inorganic?
Answers
A inorganic is carbon dioxide,carbides,carbonates,cyanid,cyanate,thiocyanates, carbon dioxide and monoxide and much more.
The drinking of alcohol beverages by a pregnant woman is harmful to the development of her fetus. This is most damaging early in a pregnancy because during this time
Answers
Answer:
The drinking of alcoholic beverages by a pregnant woman is harmful to the development of her fetus. This is most damaging early in pregnancy because during this time because many of the essential organs of the fetus are forming.
Explanation:
Most of the essential organs and structures of a fetus are formed in the first 9 weeks of gestation.
Answer:
the fetus's liver is not developed enough to process alcohol, if it has developed a liver at all at that point in the pregnancy cycle. So what happens is the baby can develop something called fetal alcohol syndrome, where the alcohol consumption of the mother begins to affect the growth and development of the fetus.
Explanation:
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Which of the following best defines PRODUCERS? *
Answers
Answer: C.
Explanation:
plants are producers
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sciencebiologybiology questions and answerswhich of the following is/are true of a bacteriophage entering the lysogenic cycle? group of answer choices it is called a temperate phage upon incorporation into the host genome, it is referred to as a provirus upon incorporation into the host genome, it is referred to as a prophage all of these are correct
Question: Which Of The Following Is/Are True Of A Bacteriophage Entering The Lysogenic Cycle? Group Of Answer Choices It Is Called A Temperate Phage Upon Incorporation Into The Host Genome, It Is Referred To As A Provirus Upon Incorporation Into The Host Genome, It Is Referred To As A Prophage All Of These Are Correct
Which of the following is/are true of a bacteriophage entering the lysogenic cycle?
Group of answer choices
it is called a temperate phage
upon incorporation into the host genome, it is referred to as a provirus
upon incorporation into the host genome, it is referred to as a prophage
all of these are correct
Answers
The true statement of Bacteriol phage entering the lysogenic cycle is it is known as a temperate phage upon joining into the host genome, Option A is correct.
Phage DNA is incorporated into the host genome during the lysogenic cycle, where it is transmitted to subsequent generations. The pro-phage may enter the lytic cycle and excise in response to environmental stressors like starvation or exposure to harmful chemicals. Prophages or temperate phages are lysogeny-capable phages.
"Bacteriophages," or "phages" for short, are viruses that specifically infect bacteria. Lysogeny is typically characterized by the insertion of the viral genome into the host genome or another cell replicon (e.g., plasmid). These viruses are not living organisms but are a major contributor to the ecosystem.
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Complete question as follows :
which of the following is/are true of a Bacteriol phage entering the lysogenic cycle? group of answer choices
A. it is called a temperate phage upon incorporation into the host genome,
B. it is referred to as a pro virus upon incorporation into the host genome,
C. it is referred to as a pro phage
D. all of these are correct
1.Mg + O -------- > X
X +OH -------- > Y
A. X is MgO and Y is MgOH
B. X is MgO and Y is MgH
C. X is MgOH and Y is MgO
D. X is MgO and Y is OHMg
2. Identify the pathway of carbon dioxide after the exchange of gases in the lungs?
A. Alveolus → bronchiole → bronchus→ trachea → nose
B. Alveolus → traches → bronchiole→ bronchi → nose
C. Nose→ bronchus→ trachea→ bronchiole → alveolus → nose
D. Trachea → bronchus → bronchiole→ alveolus→ nose
3. Choose the correct reaction.
A. CuSO₄ + FeSO₄ ------ > Cu+Fe
B. Cu + FeSO₄ ----------- > CuSO₄ +Fe
C. CuSO₄ + Fe -------- > FeSO₄ +Cu
D. FeSO₄ + Fe --------- > FeSO₄ + F
4. Which of the following is a neutralization reaction?
A. Sodium chloride + Water→ Sodium hydroxide + Hydrochloric acid
B. Calcium carbonate + Water→ Calcium hydroxide + Carbon dioxide
C. Sodium hydroxide + Hydrochloric add →Sodium chloride + Water
D. Copper sulphate + Zinc→ Zinc sulphate + Copper
unnecessary replies will be reported
Answers
3. C : replacement reaction
4. C : in neutralisation the product is always water and a salt
What physical characteristic helps a lemur keep balance as it jumps from tree to tree? (1 point)
a lemur jumping between trees
Gray fur
Long tail
Small head
Strong eyes
Answers
Answer:
LONG TAIL
Explanation:
A lemur's long tail serves as an important balancing tool. Lemurs, like many other arboreal animals, spend a lot of time moving through trees and need to maintain their balance as they jump, climb, and move along branches.
The tail acts as a counterbalance to the lemur's body, helping it to stay stable and preventing it from falling. The long tail can be moved in different directions to adjust the lemur's center of gravity and maintain balance as it moves through the trees.
Additionally, a lemur's tail is covered in fur, which can help to provide additional grip and traction on branches and other surfaces, further aiding in balance and stability.
Overall, a lemur's long tail is an important adaptation that helps them to navigate their arboreal environment with precision and agility.
Anatomic dead space greatly affects the efficiency of pulmonary ventilation.
a. true
b. false
Answers
The correct option is a. true.
Anatomic dead space greatly affects the efficiency of pulmonary ventilation is a true statement.
What is pulmonary ventilation?Breathing is the general name for pulmonary ventilation. The act of air into the lungs at inspiration (inhalation) and exiting the lungs during expiration is known as it (exhalation).
Some key points of pulmonary ventilation are-
The respiratory system, often known as pulmonary ventilation, supports breathing. Air is inhaled during pulmonary breathing through nasal and oral canals (nose or mouth). It passes into the lungs via the pharynx, throat, and trachea. After that, air is expelled and returns along the same path. Pulmonary ventilation is triggered by changes in the volume as well as air pressure within the lungs. Both diaphragm plus external intercostal muscle contract as the rib cage raises during a typical inhale. As the lungs expand, the air pressure decreases and more air rushes in. Normal exhalation causes the muscles to relax. Air is ejected, the lungs contract, and the air pressure increases.To know more about Pulmonary ventilation, here
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In each of the following pairs, circle the species with the larger atomic radius:
(a) Mg or Ba
(b) S or S2-
(c) Cu+2 or Cu
(d) He or H-
(e) Na or CI
Answers
The atoms with the largest atomic radius are:
(a) Ba
(b) S
(c) Cu
(d) H-
(e) Na
Which atoms have the largest atomic radius?
(a) Ba has a larger atomic radius than Mg because Ba has more electron shells than Mg, even though they are in the same period.
(b) S has a larger atomic radius than S2- because S2- has gained two electrons, which increases the effective nuclear charge and decreases the atomic radius.
(c) Cu has a larger atomic radius than Cu+2 because Cu+2 has lost an electron, which decreases the shielding effect of the electrons and increases the effective nuclear charge, pulling the remaining electrons closer to the nucleus.
(d) H- has a larger atomic radius than He because H- has one more electron than He, and the additional electron adds another energy level to the atom, increasing its size.
(e) Na has a larger atomic radius than Cl because Na is a metal and Cl is a non-metal, and metals tend to have larger atomic radii than non-metals.
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Which best describes chromosomal dilatation
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Answer:Changes that affect the structure of chromosomes can cause problems with growth, development, and function of the body's systems. These changes can affect many genes along the chromosome and disrupt the proteins made from those genes.
Structural changes can occur during the formation of egg or sperm cells, in early fetal development, or in any cell after birth. Pieces of DNA can be rearranged within one chromosome or transferred between two or more chromosomes. The effects of structural changes depend on their size and location, whether gene function is interrupted, and whether any genetic material is gained or lost. Some changes cause health problems, while others may have no effect on a person's health.
Explanation: took the test
How does the structure of a nerve compare to that of a skeletal muscle? Which of the descriptive terms for nerves have similar counterparts in muscle histology?
Answers
Answer:
The comparison of these structures is very interesting because they are very different histologically but have certain similarities or factors in common.
Muscle histology is classified into skeletal muscle, smooth muscle, and cardiac muscle.
In the cardiac muscle there is a continuity of the cells by means of desmosomal junctions to better transmit chemical impulses or signals and allow simultaneous cardiac rhythmic contraction.
In smooth muscle, muscle fibers are innervated by the autonomic nervous system, while in skeletal muscles, they are innervated by the autonomic, that is, by the voluntary or conscious nervous system.
These last two present myocytes submerged in structures such as endomysium, perimysium and ectomyse.
The muscle fibers in the histological sections can be seen in longitudinal or transverse sections and they will be seen in different ways because of different perspectives, but in both sections, well-colored nuclei can be seen and central to the cell, also the cells have a tapered shape ... Something that differs from neurons since they are star shaped.
Muscle cuts can be seen with histological techniques such as hematoxylin and eosin or PAS, whereas nerve structures such as nerves must be seen through Argentine impression.
The nerves in turn present peripheral myelin structures or not .. Where it is called a myelin sheath and it surrounds them in a sauteed way along the axon. In turn, the somas present the central nucleus to the cell just like the muscle cells ...
The nerves with the muscles make up the motor unit, which is the presynaptic membrane, intersynaptic space and the postsynaptic muscular membrane, it is here that magic and the induction of contraction take place.
Explanation:
Finally, another thing to add is that the neurons, in turn, are isolated cells that interconnect with each other to transmit their stimuli, which is fundamental, as well as the function of cardiac muscle cells, in both cell types, the prolongation of the stimulus or chemical signal is essential.
How would you design an investigation according to the scientific method?
Answers
Answer:
1Identify a research question or problem.
2Form a hypothesis.
3Gather evidence, or data, to test the hypothesis.
4Analyze the evidence.
5Decide whether the evidence supports the hypothesis.
6Draw conclusions.
7Communicate the results.
What do you think of the butterfly effect. Use at least one example.
Answers
The butterfly effect is the concept in chaos theory that small initial differences in the starting conditions of a nonlinear system can lead to vastly different outcomes in the future, and one example of the butterfly effect is weather forecasting.
What is the butterfly effect?The butterfly effect is a concept that originated in the field of chaos theory, which studies the behavior of nonlinear systems that are highly sensitive to initial conditions. The idea of the butterfly effect comes from the analogy that the flap of a butterfly's wings in one part of the world could ultimately cause a hurricane in another part of the world, due to the complex interactions and feedback loops within the Earth's atmosphere. This concept has been applied to many different fields, including physics, biology, economics, and the social sciences.
Hence, the butterfly effect is the concept in chaos theory that small initial differences in the starting conditions of a nonlinear system can lead to vastly different outcomes, and an example of the butterfly effect is weather forecasting.
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3. M. Garcia noticed pain on the left side of his chest under his arm The pain was stronger the
next day and his wife noticed patches of a red bumpy rash in the area of the pain. By the time
he saw his doctor that afternoon blisters and additional red patches had emerged. The doctor
asked about childhood illnesses and confirmed that Mr. Garcia had had chickenpox.
What is the possible diagnosis?!
H
Answers
Answer:
The possible diagnosis of M. Garcia with chest pain radiating to the left arm and the presence of red patches and vesicles is Herpes zoster.
Explanation:
Herpes Zoster is a disease produced by the varicella-zoster virus, and has a history of having had chickenpox in childhood or youth.
The varicella virus remains dormant in the body for several years, and can reappear, presenting as a localized and painful rash that can produce a neuritis in the affected territory.
The clinical symptoms of the M. Garcia —pain in the thorax irradiated to the left arm, red patches and vesicle-blisters— associated to the antecedent of chickenpox make think of a diagnosis of Herpes Zoster.
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how are mutualism relationships different from predator and prey relationships?
Answers
Answer:
Mutualistic relationships is where both organisms cooperate and benefit from each other while predator prey relationships is just an organism hunting down another organism.
Explanation:
Hope that helps
Answer:
A predator-prey relationship occurs between a wolf and a deer, and a symbiotic relationship occurs between a parasite like a tapeworm and a rabbit
Explanation:
Another example of such interaction dynamics can be observed with plants, which have many different types of relationships
.The genes of a bacterial __________________ are transcribed into a single mRNA. Many bacterial promoters contain a region known as a(n) __________________, to which a specific transcription regulator binds. Genes in which transcription is prevented are said to be __________________. The interaction of small molecules, such as tryptophan, with __________________ DNA-binding proteins, such as the tryptophan repressor, regulates bacterial genes. Genes that are being __________________ expressed are being transcribed all the time.
operon
operator
repressed
allosteric
constitutively
Answers
The genes of a bacterial operon are transcribed into a single mRNA. Many bacterial promoters contain a region known as an operator, to which a specific transcription regulator binds. Genes in which transcription is prevented are said to be repressed. The interaction of small molecules, such as tryptophan, with allosteric DNA-binding proteins, such as the tryptophan repressor, regulates bacterial genes. Genes that are being constitutively expressed are being transcribed all the time.
1. Operon: In bacteria, an operon is a functional unit of DNA that consists of multiple genes that are transcribed together as a single mRNA molecule. These genes are typically involved in related functions or part of the same biochemical pathway.
2. Operator: The operator is a specific region within the operon DNA sequence. It is a regulatory element where a transcription regulator, such as a repressor protein, can bind. The binding of the regulator to the operator can control the transcription of the genes within the operon.
3. Repressed: When a gene or set of genes in an operon is "repressed," it means that transcription is inhibited or prevented. This repression can occur when a specific transcription regulator binds to the operator, blocking the RNA polymerase from initiating transcription.
4. Allosteric: Allosteric refers to the ability of a molecule to bind to a protein and cause a conformational change that affects the protein's activity at a different site.
5. Constitutively expressed: Genes that are constitutively expressed are continually transcribed, meaning they are active and producing mRNA all the time, regardless of external signals or conditions.
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Do most volcanoes on land occur in the Northern Hemisphere or southern Hemisphere? Explain why you think so?
Answers
Answer: Southern hemisphere.
Explanation:
Most of the volcanoes are located in what is called the "ring of fire" in the Pacific Ocean.
why is it necessary to collect goldfish color frequency data over many generations instead of juist grom one generatio
Answers
Collecting goldfish color frequency data over many generations is necessary because it helps to identify whether the observed trait is heritable or not.
In a single generation, environmental factors such as diet, temperature, and water quality can influence the coloration of the goldfish, and these non-genetic factors can mask the underlying genetic variation. By observing the color frequencies over multiple generations, it becomes possible to see patterns that reflect the underlying genetic inheritance of the trait.
Furthermore, the collection of data over many generations allows for the identification of any changes in the frequency of specific traits over time, which can indicate the presence of evolutionary processes such as genetic drift or natural selection. This long-term data is critical for understanding the genetics and evolution of a particular trait in a population.
The complete question is
Why is it necessary to collect goldfish color frequency data over many generations instead of just from one generation?
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The images show the wings of two different organisms. The wings of the housefly and the bat are . This indicates that
Answers
This indicates that the wings of house fly and bat are analogous organs.
What are analogous organs?
Analogous organs are the organs that are different anatomically in structure but perform the same function.
From the diagram, the wings of house fly and bat do not arise from same body part.
The wings of house fly have extra appendages attached at the back but that of the bat wings are modified
Hence, we conclude that both should be considered analogous to each other.
The organs which have different basic structure and origin but are similar in their appearance and functioning, are called analogous organs some examples include
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which lymphoid organ(s) appear(s) before the others?
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The primary lymphoid organ that appears before the others is the thymus.
The thymus is a lymphoid organ involved in the development and maturation of T cells. It appears early in the development of the immune system, even before the secondary lymphoid organs like lymph nodes and spleen.
Embryologically, the thymus gland is derived from the third pharyngeal pouch. In this article, we shall look at the anatomy of the thymus gland – its structure, position and vasculature.
Preparations of thymus…. immune system: T cells. …way to mature in the thymus, they do not yet express receptors for antigens and thus are indifferent to stimulation by them. Within the thymus the T cells multiply many times as they pass through a meshwork of thymus cells.
The gland continues growing until age 13, after which it very slowly starts to shrink. Where is the thymus gland located? The thymus gland has two possible locations. It is usually found in front of the heart, but in some people, the thymus gland is located in the neck or upper chest.
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If you had the following food chain: Sun→grass→mouse→snake→bird of prey Which of the following would NOT happen if the snake trophic level was removed? A. The mouse population would decrease B. The bird of prey population would decrease C. The sun would stay the same D. The grass population would decrease
Answers
Answer:
Option A
Explanation:
If the snake trophic level is removed, the following things will happen
=> The mouse population will increase because they would no more be a prey
=> The bird of prey population will decrease because their predator is no more present
=> The sun would stay the same
=> The grass population would decrease as their predator population has increased.
The mouse population decreasing won't happen when the snake trophic
level is removed.
In the trophic level below, the snake feeds on the mouse, the bird of prey
then feeds on the snakes.
Sun→grass→mouse→snake→bird of prey
However, when the snake trophic level is removed , the mouse have fewer
predators which feeds on it. This enables the population of mouse to
increase in the ecosystem as those on top of the trophic level usually have a
smaller population to the others.
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List the six fundamental elements found in living organisms in the text area below.
Answers
Explanation: hopes it helps
Living organisms often contain trace amounts of several elements, but the most abundant ones are oxygen, carbon, hydrogen, nitrogen, calcium and phosphorus
Answer:
Carbon , hydrogen, oxygen , nitrogen , phosphorus, and sulfur
Explanation:
got right on edge.
culture of staphylococcus aureus, a gram-positive coccus, is about 48 hours old. what color would these cells likely appear under the microscope after gram staining? multiple choice 6 purple red/pink colorless
Answers
Gram-positive cells show up purple when the staining procedure is finished, while gram-negative cells show up pink. Crystal violet is used as the main stain in the gram stain.
Which color might you anticipate following a Gram stain?A Gram stain has a purple color. When the dye and bacteria interact, the bacteria in a sample either remain purple or transform to pink or red. If the bacteria remain purple, they are Gram-positive. If the bacteria become pink or crimson, they are Gram-negative.
After staining, what color are gram-positive cells?Peptidoglycan, which is found in gram-positive bacteria's cell walls in thick layers, is a component of the cell walls of many bacteria. In gram-positive bacteria, the peptidoglycan makes up around 90% of the cell wall. They emerge as a result of this.
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