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?

#Part-B Specialized Branches in Biotechnology

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

#Question id: 400

#Part-B Specialized Branches in Biotechnology

Consider two solutions: solution X has a pH of 4; solution Y has a pH of 7. From this information, we can reasonably conclude that ________.

#Question id: 4325

#Part-A Aptitude & General Biotechnology

Cell differentiation always involves

#Question id: 5720

#Part-B Specialized Branches in Biotechnology

Which two of the following are the CORRECT statements ?

P. Nondisjunction in the parental meiosis is not essential to produce diploid organisms

Q. Nondisjunction in the parental meiosis is essential to produce aneuploid organisms

R. Nondisjunction in the parental meiosis is essential to produce hexaploid organism

S. Nondisjunction in the parental meiosis is essential to produce tetraploid organisms

#Question id: 9274

#Part-B Specialized Branches in Biotechnology

The different types of carotenoids found in photosynthetic organisms, the all carotenoids are

#Question id: 5948

#Part-A Aptitude & General Biotechnology

What was the day of the week on Republic Day of India (26 January 1947)?