Which of the following is able to phosphorylate target proteins and facilitate progress through the cell cycle: O A cyclin alone O A CDK alone O A complex of a cyclin and a CDK O A steroid hormone receptor O The signal recognition particle

Human Anatomy & Physiology (11th Edition)
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Chapter1: The Human Body: An Orientation
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**Question:**

Which of the following is able to phosphorylate target proteins and facilitate progress through the cell cycle:

- A cyclin alone
- A CDK alone
- A complex of a cyclin and a CDK
- A steroid hormone receptor
- The signal recognition particle

**Explanation:**

The question is a multiple-choice question pertaining to cell cycle regulation. The focus is on identifying which components are responsible for phosphorylating proteins, a critical process in regulating the cell cycle. 

Cyclins are proteins that regulate the cell cycle by activating cyclin-dependent kinases (CDKs) which are crucial for cell cycle progression. A CDK alone does not have catalytic activity without binding to a cyclin. Therefore, the correct answer is a complex of a cyclin and a CDK. 

Other options, such as a steroid hormone receptor and the signal recognition particle, are not directly involved in cell cycle regulation through phosphorylation.
Transcribed Image Text:**Question:** Which of the following is able to phosphorylate target proteins and facilitate progress through the cell cycle: - A cyclin alone - A CDK alone - A complex of a cyclin and a CDK - A steroid hormone receptor - The signal recognition particle **Explanation:** The question is a multiple-choice question pertaining to cell cycle regulation. The focus is on identifying which components are responsible for phosphorylating proteins, a critical process in regulating the cell cycle. Cyclins are proteins that regulate the cell cycle by activating cyclin-dependent kinases (CDKs) which are crucial for cell cycle progression. A CDK alone does not have catalytic activity without binding to a cyclin. Therefore, the correct answer is a complex of a cyclin and a CDK. Other options, such as a steroid hormone receptor and the signal recognition particle, are not directly involved in cell cycle regulation through phosphorylation.
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