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Chapter 10: Q. 19 (page 277)

Which protein is a positive regulator that phosphorylates other proteins when activated?

a. p53

b. retinoblastoma protein (Rb)

c. cyclin

d. cyclin-dependent kinase (Cdk)

Short Answer

Expert verified

Cyclin-dependent kinase (CDK) is a positive regulator that phosphorylates other proteins when activated. The correct option is (d).

Step by step solution

01

Step 1. Introduction 

The cell's progression through the numerous checkpoints is facilitated by positive regulators, which are regulatory components.

02

Step 2. Explanation of correct option

Positive regulators include cyclin-dependent kinases (Cdks). They're in charge of making sure the cell gets to all of the many checkpoints it has to go through. These kinases phosphorylate various proteins through the Cdk pathway. It is phosphorylation that activates the protein because it alters its structure. Cdks phosphorylate proteins that aid in the progression of the cell to another stage.

Thus, the correct option is (d).

03

Step 3. Explanation of Incorrect Options

p53 is one type of tumor suppressor protein, not a positive regulator that phosphorylates other proteins when activated.

Thus, option (a) is incorrect.

As a tumor suppressor, Rb protein is crucial in regulating cell growth and tumor development. So, this is not a positive regulator that phosphorylates other proteins when activated.

Thus, option (b) is incorrect.

Cyclin is a positive regulator but does not phosphorylate other proteins when activated.

Thus, option (c) is incorrect.

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Most popular questions from this chapter

Which molecule is a Cdk inhibitor that is controlled by p53?

a. cyclin

b. anti-kinase

c. Rb

d. p21

Many of the negative regulator proteins of the cell cycle were discovered in what type of cells?

a. gametes

b. cells in G0

c. cancer cells

d. stem cells

Figure 10.6 Which of the following is the correct order of events in mitosis?

a. Sister chromatids line up at the metaphase plate. The kinetochore becomes attached to the mitotic spindle. The nucleus reforms and the cell divides. Cohesin proteins break down and the sister chromatids separate.

b. The kinetochore becomes attached to the mitotic spindle. Cohesin proteins break down and the sister chromatids separate. Sister chromatids line up at the metaphase plate. The nucleus reforms and

the cell divides.

c. The kinetochore becomes attached to the cohesin

proteins. Sister chromatids line up at the metaphase plate. The kinetochore breaks down and the sister chromatids separate. The nucleus reforms and the cell divides.

d. The kinetochore becomes attached to the mitotic spindle. Sister chromatids line up at the metaphase plate. Cohesin proteins break down and the sister chromatids separate. The nucleus reforms and the

cell divides.

Figure 10.14 Human papillomavirus can cause cervical cancer. The virus encodes E6, a protein that binds p53. Based on this fact and what you know about p53, what effect do you think E6 binding has on p53 activity? a. E6 activates p53 b. E6 inactivates p53 c. E6 mutates p53 d. E6 binding marks p53 for degradation

Eukaryotic chromosomes are thousands of times longer than a typical cell. Explain how chromosomes can fit inside a eukaryotic nucleus.
See all solutions

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