A scientist is comparing the outer layer of an onion cell to the outer layer of a human skin cell. What is unique about the outer layer of the onion cell compared to the skin cell?

Answers

Answer 1
Answer:

Answer:

contains cellulose.

Explanation:

B

Answer 2
Answer: The onion cell (and all plants for that matter) should have an extra layer around the cell known as the "Cell Wall" it offers more protection and helps support the plant. Human cells (and animal cells) do not have these cell walls they simply have a cell membrane while plants have both. also Plant cells are Square or rectangular while animal and human cells are round or ovalish in shape.

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A viral genome is studied. It is composed of 33% Adenine, 28% Thymine, 22% Cytosine and 17% Guanine. Predict whether this genome is single or double stranded and whether it is DNA or RNA based.A) The genome is DNA based and single stranded.

B) The genome is DNA based and double stranded.

C) The genome is RNA based and single stranded.

D) The genome is RNA based and double stranded.

Answers

Answer:

A) The genome is DNA based and single stranded.

Explanation:

The reason why it is DNA based is because DNA contains thymine base (T). It is not RNA based because RNA contains uracil base (U) instead of thymine and in the given question there is not uracil mentioned.

It is single stranded because according to Chargaff's rule a double stranded nucleic acid must have the ratio of purine bases to pyrimidine ratio as 1:1.

Adenine (A) & Guanine (G) are purine bases while Thymine (T) & Cytosine (C) are pyrimidine bases so according to Chargaff's rule AG/CT = ~ 1. It means [A+G] = [C+T]

Also, A makes interaction with T while C makes interaction G. It means,

[A] = [T]

[C] = [G]

By this we can easily infer that a double stranded DNA will have as much A as much it has T & same goes with C & G.

But, in the given question, A = 33% while Thymine = 28% which are not equal so this means that this molecule is single stranded.

B

Explanation: RNA contains the nucleotide “Uracil” therefore this could not be RNA and the percentages closely match up therefore we can assume that the DNA is double stranded I.e. Double helix

Please help! Match each organism with the correct trophic level it occupies in the food chain.

Answers

Blueberry: 1st Trophic Level

Rabbit: 2nd Trophic Level

Snake: 3rd Trophic Level

Cat: 4th Trophic Level

Hope this helps :P

plz give me the brainliest if it does : )

Answer:

The blueberry we go on the fourth the The rabbit would go next I think the snake would go after that and then the cat.

Explanation:

The snake and the cat might be switched but I’m pretty sure that the cat would be able to eat the snake easier than the snake would be able to get the cat so all I can say is go with your gut on that one .

What is the silly scientific name for an unsharpened pencil?What is the silly scientific name for a piece of white chalk?

Answers

Answer:

Unsharpened Pencil - Wadget

White Chalk - Screecher

Explanation:

A spherical bacterial cell has a radius of 3μm . The human egg cell has a radius of 100μm . Which statement correctly indicates the cell that is able to more efficiently exchange materials with the external environment and provides a correct explanation?

Answers

Answer:

The correct statement would be - the bacterial cell due to the largest surface-to-volume ratio.

Explanation:

The surface area to volume ratio plays a very important role in determining the rate of the diffusion enter and exit from the cell body. If the surface-to-volume ratio is lower then the rate of diffusion would be lower to similarly with an increase in the ratio, the rate of diffusion also increases.

So, the bacteria like small organism have a cell which is exposed to a large surface area to the surrounding in comparison of the human egg cell.

Thus, the correct answer would be - the bacterial cell due to the largest surface-to-volume ratio.

Final answer:

A smaller spherical bacterial cell with a radius of 3μm can more efficiently exchange materials with the external environment compared to a larger human egg cell with a radius of 100μm, due to its higher surface area-to-volume ratio.

Explanation:

The statement that correctly indicates the cell that is able to more efficiently exchange materials with the external environment is that the spherical bacterial cell with a radius of 3μm can more efficiently exchange materials. This is because a smaller cell has a higher surface area-to-volume ratio, allowing for a faster exchange of materials through the cell membrane. On the other hand, the human egg cell with a radius of 100μm, being larger, has a lower surface area-to-volume ratio and is less efficient in exchanging materials with the external environment.

Learn more about bacterial cell here:

brainly.com/question/21374866

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Tumors secrete chemical signals that cause blood vessels from the circulatory system to grow into the tumor, providing nutrients. What is this called?Select one:
a. Mitosis
b. Mutation
c. Apoptosis
d. Angiogenesis
e. Metastasis

Answers

The answer is D.Angiogenesis

♡♡Hope I helped!!! :)♡♡

How do homologous structures provide evidence for evolution?

Answers

The presence of a homologous structure suggests common ancestry, and further suggests that the nearest common ancestor of two organisms had the trait which is homologous. Comparison of several modern organisms with different variations of the same homologous structure can suggest what the original ancestor's actual characteristics were, and comparison of the structure in different organisms can also suggest which organisms are more or less closely related