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.
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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)
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
Mucous membranes and tears contain antimicrobial substances such as _____.
What will be an ideal response?
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