In what ways do human X and Y chromosomes differ from one another?
A. The X chromosome is larger than the Y.
B. The X chromosome has about 1,000
genes and the Y has only about 50.
C. The X chromosome is found only in
females, while the Y is found only in males.
D. The X and Y chromosomes differ both in
size and in number of genes.
E. The X and Y chromosomes have no
regions in common and do not pair during
meiosis.
D
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Which cell structure is present during plant cell division but not animal cell division?
a. cleavage furrow. b. cytokinesis. c. spindle. d. sister chromatids. e. cell plate.
What would likely be true when P = 0.9?
A) Rate of extinction would be high. B) Rate of colonization would be high. C) Proportion of patch occupied would be low. D) Corridor size would be small.
Why does taking antibacterial medications put women at risk for candidiasis?
A) Antibacterials can alter metabolism, creating conditions that favor the growth of Candida albicans. B) Antibacterials deplete the normal bacterial microbiota, resulting in a change of pH. C) Antibacterials serve as growth stimulants for Candida albicans. D) Bacteria killed by antibacterials provide nutrients for Candida albicans. E) Depletion of the bacterial microbiota results in higher carbon dioxide levels, (which favor the growth of Candida albicans).
Antibody-mediated immunity is created by
a. "killer" T cells. b. dendritic cells. c. helper T cells. d. B cells. e. phagocytes.