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Sholpan [36]
3 years ago
15

In eukaryotic cells, the timing of the cell cycle is regulated by

Biology
1 answer:
larisa [96]3 years ago
3 0
Regulatory proteins control the cell cycle.

If the regulatory proteins are malfunctioning or absent, the cells may reproduce abnormally fast, causing a tumor.
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Professional antigen-presenting cells, such as phagocytes, are the first cells to encounter a pathogen (apcs). This means they have the ability to activate cells of the adaptive immune system.

<h3>What is meant by Pathogen?</h3>
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<span>B. A producer supplies energy for the consumers in the ecosystem.

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