The Retinoblastoma Protein (PRB), Like P53, Serves as A(n) ________

Question

The retinoblastoma protein (pRB), like p53, serves as a(n) ________ in regulating the cell cycle.
A) tumor suppressor
B) tumor enhancer
C) up regulator
D) oncogene
E) pseudooncogene

Accepted Answer

The retinoblastoma protein (pRB) functions as a tumor suppressor by regulating the cell cycle, specifically by inhibiting cell proliferation in G1 phase until all the necessary growth signals are present.