What happens to CDK in the absence of cyclin?

A. It is inactive.
B. It is degraded.
C. It becomes phosphorylated.
D. Answers a and c are both correct.


A

Biology & Microbiology

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Why does the microbiota of the reproductive tract change as the female ages from childhood to adulthood to old age? 

A. The microbes in the vagina change the environment, which affects the populations of microbes living there. B. The pH of the vagina changes over time. C. Post-menopausal women have a stable microbiota. D. Her estrogen and progesterone levels change over time. E. All of these statements are true.

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During metaphase I of meiosis, genetic information is exchanged between two homologous chromosomes, resulting in new combinations of alleles. This process is called ________.

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