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TiliK225 [7]
3 years ago
13

Why are the sepals and petals reffered to as "accessory parts" of the plant?

Biology
1 answer:
iren2701 [21]3 years ago
5 0
The answer is because they are not necessary for the plant to reproduce
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41-Steroids are a class of lipids. Which of the following is an example of a steroid
Andrei [34K]
<h2>Answer:  (b) Cholesterol</h2>

Explanation:

As the name suggests, cholesterol is a sterol (a modified steroid). It is biosynthesized by animal cells.

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How would you account for the fact that fossils of fish are not present in the older layers of rock?
Mademuasel [1]

Answer:

The fish did not yet exist when the old layers of rocks were deposited. In fact, animals with hard parts did not evolve until about 600 million years ago, which is only about 13% of the 4.5 billion year age of the Earth. Multicellular animals without hard parts left tracks in older sediments, but had no fossilize-able body parts.

Explanation:

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3 years ago
Researchers are studying the abnormal activity of kinases in relation to cancer. Theoretically, how might researchers use signal
myrzilka [38]

Answer:

I am pretty sure that the answer is A.

Explanation:

Protein kinases regulate the cell cycle by giving the "go-ahead" or "stop" signal at checkpoints in the cycle. A mutation/disruption in the protein kinases can result in it not doing its job properly. As a result, it can give the 'go-ahead' signal to all cells (mutated or not) to continue through the cell cycle. A distrupted kinase will infleunce the enviornment for a cancer cell as the cancer cell can continue to divide continuously.

I do not think the answer is D because G-couped receptirs are not involed in the regulation of the cell cycle. Additionally, I do not think the answer is C since the production of cAMP (a secondary messgenger amplifies transduction signals; this doesn't have anything to do with cancer?) Finally, between A and B I know that a direct result of cancer is due to a distruption in either protien kinases or  growth factors (not in the answer choices). Since one of the factors that  leads to cancer is present in answer choice A, I think that is the one. However, this is just my reasoning, I am not 100% sure!

3 0
2 years ago
25 points!
andrey2020 [161]

Answer: A Tree

Explanation:

7 0
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What are the options?

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