Practice Questions

TLS Online TPP Program

#Question id: 12482

The Rb protein has been called the “master brake” of the cell cycle. How the Rb protein acts as a cell cycle brake?

#Unit 2. Cellular Organization

Rb bound to E2F and function as transcriptional repressors because Rb recruits chromatin-modifying enzymes that promote deacetylation and methylation of specific histone lysines, causing chromatin to assume a condensed, transcriptionally inactive form.
S phase CDKs and mitotic CDKs maintain Rb protein in the phosphorylated state throughout the S, G2, and early M phases.
Rb bound to E2F and promotes ubiquitinylation of E2F and inhibits chromosomal segregation.
Rb bound to E2F and promotes acetylation which prevents unloading of cohesins.

More Questions

TLS Online TPP Program

#Question id: 101

#Unit 1. Molecules and their Interaction Relevant to Biology

You have two bottles, each of which contains a white, crystalline substance. Your lab director tells you that one contains lactose and the other sucrose. Your job is to determine which bottle contains which sugar. Which procedure would you use?

TLS Online TPP Program

#Question id: 12046

#Unit 7. System Physiology – Animal

Which of the following ions has the highest concentration in saliva under basal conditions?

TLS Online TPP Program

#Question id: 23775

#Unit 7. System Physiology – Animal

Which cells transmit visual signals from the retina to the CNS?

TLS Online TPP Program

#Question id: 29574

#Unit 6. System Physiology – Plant

Some of the following statement are given regarding ToxA gene