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12 May, 20:37

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

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Answers (2)
  1. 12 May, 23:08
    0
    a. Cyclin A

    Explanation:

    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.
  2. 13 May, 00:02
    0
    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.
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