31 January, 08:18
Which of the following cyclin molecules is essential to activate pre-replication complexes (pre-RCs) ?
a. Cyclin A
b. Cyclin B
c. Cyclin C
d. Cyclin D
e. Cyclin E
31 January, 09:03
Answer: Yes definitely Cyclin A
Explanation: The concentrations of cyclin A peak during the G2 stage, suggesting that the start of this stage is triggered by high concentrations of the Cdkcs it forms. Similarly, cyclin A vanishes around the end of the G2 stage. These two facts together indicate that the G2 cycle is controlled by Cdkcs formed with cyclin A.
Similarly, cyclin E controls the transition from G1 to S.
These examples show how complex interactions among the different kinds of molecules in the cell cause distinct cycles of activities.
31 January, 10:03
a. Cyclin A
Cyclin A -
Cyclin A is one of the species of the family cyclin, which is a collection of proteins whose function is regulating the progression of the cell cycle.
The stages via which a cell pass are culminate in its division and replication are collectively are called the cell cycle.
As we know, the successful replication and division of a cell is important for the survival of the cell, the cell cycle is regulated by many components for the error - free and efficient progression of the cell cycle.
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» Which of the following cyclin molecules is essential to activate pre-replication complexes (pre-RCs) ? a. Cyclin A b. Cyclin B c. Cyclin C d. Cyclin D e. Cyclin E