31. How many chromatids are there in a duplicated chromosome?

A. One
B. Two
C. Three
D. Four

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32. The term homologous chromosomes

A. refers to replications of the same chromosome
B. is another name for sister chromatids
C. must be haploid
D. means a pair of chromosomes of the same kind, such as sex chromosomes

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33. At the center of the cell cycle control system is Cdk, a protein that

A. is phosphorylated to become active
B. binds to different cyclins
C. is only active during mitosis
D. manufactures growth factors

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34. Each chromosome contains two chromatids by the end of the __________ phase in the life cycle of a human cell.

A. C
B. G₂
C. M
D. S

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35. Which of the following is the primary growth phase of a cell?

A. G₁
B. G₂
C. M
D. G₀

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