A population of 15 birds inhabits a small island. Ten of the birds are dark brown, and five of them are light brown. By chance, two of the dark brown birds and three of the light brown birds die before producing any offspring. All of the birds in the next generation are dark brown. This change in phenotypic frequency can be attributed to __________.
a. natural selection
b. gene flow
c. sexual selection
d. genetic drift
Answer: d. genetic drift
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a. Crayfish b. Mammals c. Reptiles d. Birds e. Fish
Effector helper T cells release cytokines only
when which of the following occur?
a. The effector helper T cell binds to an antigen-presenting dendritic cell. b. The effector helper T cell binds to a memory T cell. c. The effector helper T cell binds to a complement protein. d. The effector helper T cell binds to MHCantigen complexes on B cells. e. Any of these can stimulate cytokine production.
Equivalent segments of DNA are exchanged between chromosomes as a result of
A. segregation. B. crossing-over. C. fertilization. D. independent assortment.
The space between the two membranes of the mitochondrion accumulates ____.
A. proteins B. H+ C. carbohydrates D. H2O2 E. CO2