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djyliett [7]
3 years ago
7

The spindle apparatus begins to become visible during

Biology
1 answer:
Rina8888 [55]3 years ago
5 0

Answer:

answer is prophase

have a nice day

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Why does a hormone only act on specific cell types in an organism and not others?
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Answer:

c) A cell must have the appropriate receptor before it can bind to the hormone.

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Hormones are chemical signals that are secreted into the circulatory system acting as regulators within the body, and even though they can reach any part on the body, <em>only certain types of cells are equipped to respond, these cells are known as target cells, when the hormone reaches a cell with an adequate receptors it triggers a signal transduction and then a response.</em>

Therefore the correct answer is c.

I hope you find this information useful and interesting! Good luck!

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5. Explain why an artery is an organ.
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Arteries are blood vessels that carry oxygenated blood away from the heart. Their walls are composed of three layers called the tunica intima, tunica media, and the tunica adventitia, which all have different cellular structures and compositions.

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DNA and sugar and phosphate

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