Part A and B A. What is the normal function of the Rb protein? A) Rb prevents the cell cycle from proceeding unless the cell is prepared to do so B) Rb causes cells to undergo apoptosis C) Rb promotes Cdk activation D) Each of the other selections is true E) Rb repairs damaged DNA
Part A and B A. What is the normal function of the Rb protein? A) Rb prevents the cell cycle from proceeding unless the cell is prepared to do so B) Rb causes cells to undergo apoptosis C) Rb promotes Cdk activation D) Each of the other selections is true E) Rb repairs damaged DNA
Human Heredity: Principles and Issues (MindTap Course List)
11th Edition
ISBN:9781305251052
Author:Michael Cummings
Publisher:Michael Cummings
Chapter12: Genes And Cancer
Section: Chapter Questions
Problem 21QP
Related questions
Question
Part A and B
A. What is the normal function of the Rb protein?
A) Rb prevents the cell cycle from proceeding unless the cell is prepared to do so
B) Rb causes cells to undergo apoptosis
C) Rb promotes Cdk activation
D) Each of the other selections is true
E) Rb repairs damaged DNA
B. How do tumors arise?
A) When cell proliferation occurs at a higher rate than cell death
B) When someone is infected with a tumor from another person
C) When cell death occurs at a very high rate
D) When cell proliferation occurs at a very low rate
Expert Solution
Step 1
Answer A) Rb is Retinoblastoma protein which is a tumor suppressor protein and belongs to pocket protein family.
Step 2
Role of Rb protein;
- Plays important role in negative control of cell cycle and further progression of tumor
- Block S phase entry and growth of cell
- Prevention of excessive cell growth by inhibition of cell cycle until a cell is ready to divide
- When cell is ready to divide,Rb is phosphorylated to form pRb which results in inactivation of Rb.
- Rb promotes cyclin dependant kinase (cDK) activation
- Rb repairs damaged DNA
Hence all options are true
Step 3
So correct option is option D
D)Each of the other selections is true
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