What stimulates secretion of testosterone by Leydig cells?

A. FSH
B. LH
C. Testosterone
D. Estradiol
E. Progesterone


Answer: B

Biology & Microbiology

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Among the largest RNA genome viruses are ________ which contain a ________ genome

A) coronaviruses / dsRNA B) coronaviruses / positive ssRNA C) polioviruses / dsRNA D) polioviruses / positive ssRNA

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Which of the following is not true of signal integration by more than one transcription factor?

A. It occurs in both bacteria and eukaryotes. B. It allows for multiple environmental signals to control the expression of a single gene. C. It is used to control the expression of genes in opposite orientations that are controlled by the same promoter. D. It can include the use of both repressors and activators at the same promoter.

Biology & Microbiology

What is meant by the clonal expansion of a B cell?

a. An activated B cell will engulf and digest anything foreign. b. An activated B cell divides into cells that give rise to memory B cells and plasma cells. c. An activated B cell will immediately begin to produce antibodies. d. An activated B cell will kill infected host cells.

Biology & Microbiology

Precambrian time

What will be an ideal response?

Biology & Microbiology