Which of the following tumor-suppressor genes encode proteins that inhibit cell division when cell conditions are unfavorable?

A. BRCA1.
B. Rb.
C. NF1.
D. p16.
E. All of these are tumor-suppressor genes, so they all produce proteins that inhibit cell division.


E. All of these are tumor-suppressor genes, so they all produce proteins that inhibit cell division.

Biology & Microbiology

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What embryo-produced hormone maintains progesterone and estrogen secretion by the corpus luteum through the first trimester of pregnancy?

A) luteinizing hormone (LH) B) follicle-stimulating hormone (FSH) C) progesterone D) human chorionic gonadotropin (hCG) E) gonadotropin-releasing hormone (GnRH)

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The greatest mass extinction of all time is occurring now, with extinction rates _____ times the historical background rate

1.10 2.100 3.1,000 4.10,000

Biology & Microbiology

Mucous membranes and tears contain antimicrobial substances such as _____.

What will be an ideal response?

Biology & Microbiology

Gene flow ____.

A. has a stabilizing influence on allele frequencies between two populations B. speeds up the divergence of two populations C. increases divergence between populations D. is promoted by isolating mechanisms E. promotes inbreeding

Biology & Microbiology