题目内容

A tumor suppressor gene

A. is a gene that always causes cancer.
B. is a gene that codes for a regulatory protein to stimulate the cell cycle.
C. is a gene that is never expressed.
D. is a gene that codes for a regulatory protein to slow down/stop the cell cycle.

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Which molecules build up then trigger the phases of mitosis only to be degraded?

A. kinase
B. cyclin
C. transcription factors
D. dehydrogenase

Which cells are not in an actively dividing state?

A. neurons
B. skin cells
C. cells of a zygote (fertilized egg)
D. bone marrow

Which phase marks the end of the cell cycle?

A. interphase
B. telophase
C. cytokinesis
D. anaphase

In the process of mitosis, how many chromatids would be present during metaphase, if the parent cell had 12 chromosomes?

A. 6
B. 12
C. 24
D. 36