Explore topic-wise MCQs in Biochemistry.

This section includes 7 Mcqs, each offering curated multiple-choice questions to sharpen your Biochemistry knowledge and support exam preparation. Choose a topic below to get started.

1.

Passage of a cell through stages of cell cycle is controlled by a protein kinase that phosphorylates many different proteins at appropriate times.

A. Cdk activating kinase
B. Cyclin-dependent kinase
C. Cyclins
D. Tyrosine kinase
Answer» C. Cyclins
Discussion
2.

Which of the following occurs in meiosis but not in mitosis?

A. Attachment of spindle fibers to kinetochore
B. Replication of DNA prior to start of cell division
C. Separation of sister chromatids at anaphase
D. Pairing of homologous chromosomes at metaphase plate
Answer» E.
Discussion
3.

At which cell cycle checkpoint, cell cycle is halted if cell s DNA is damaged?

A. G<sub>1</sub> S
B. S G<sub>2</sub>
C. G<sub>2</sub> M
D. G<sub>0</sub> G<sub>1</sub>
Answer» B. S G<sub>2</sub>
Discussion
4.

At the end of each phase of cell cycle cyclins activating Cdks in that phase are inactivated irreversibly by _____________

A. Multiple phosphorylations
B. De-phosphorylation
C. Ubiquitinylation
D. Destabilizing by proteolysis in a proteosome
Answer» E.
Discussion
5.

Cyclin dependent kinases which control progression through cell cycle checkpoints are totally activated by which of the following?

A. Binding to cyclin, plus phosphorylation by a Cdk activating protein kinase
B. Binding to cyclins
C. Phosphorylation by Cdk activating protein kinase
D. Phosphorylation by a tyrosine kinase
Answer» B. Binding to cyclins
Discussion
6.

Cdk2/cyclinE functions in ____________

A. G<sub>2</sub>/M transition
B. G<sub>2</sub>
C. M
D. G<sub>1</sub>/S transition
Answer» E.
Discussion
7.

What is Ubiquitin?

A. Protein kinase
B. Protease
C. Component of the electron transport system
D. Protein that tags another protein for proteolysis
Answer» E.
Discussion