Biochemistry Regulation Cell Cycle Protein Kinases Online Exam Quiz
Biochemistry Regulation Cell Cycle Protein Kinases GK Quiz. Question and Answers related to Biochemistry Regulation Cell Cycle Protein Kinases. MCQ (Multiple Choice Questions with answers about Biochemistry Regulation Cell Cycle Protein Kinases
Which of the following occurs in meiosis but not in mitosis?
Options
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
Cyclin dependent kinases which control progression through cell cycle checkpoints are totally activated by which of the following?
Options
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
Passage of a cell through stages of cell cycle is controlled by a protein kinase that phosphorylates many different proteins at appropriate times.
Options
A : Cdk activating kinase
B : Cyclin-dependent kinase
C : Cyclins
D : Tyrosine kinase
At which cell cycle checkpoint, cell cycle is halted if cell’s DNA is damaged?
Options
A : G1 – S
B : S – G2
C : G2 – M
D : G0 – G1
In which phase of cell cycle is DNA replicated?
Options
A : G1 phase
B : S phase
C : G2 phase
D : M phase
Cdk2/cyclinE functions in ____________
Options
A : G2/M transition
B : G2
C : M
D : G1/S transition
At the end of each phase of cell cycle cyclins activating Cdks in that phase are inactivated irreversibly by _____________
Options
A : Multiple phosphorylations
B : De-phosphorylation
C : Ubiquitinylation
D : Destabilizing by proteolysis in a proteosome
What is Ubiquitin?
Options
A : Protein kinase
B : Protease
C : Component of the electron transport system
D : Protein that tags another protein for proteolysis
Which of the following statements regarding cyclins is not correct?
Options
A : They can become linked to ubiquitin
B : They catalyze the phosphorylation of protein
C : They contain a specific amino acid sequence that target them for proteolysis
D : They are activated and degraded during cell cycle
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