Why does external fertilization typically occur much more often in aquatic animals than in terrestrial animals?
A) The gametes are hydrophobic, so they must be suspended in water to avoid clumping.
B) The gametes must be produced in large numbers, which can occur only in aquatic environments.
C) The gametes must be kept wet to avoid desiccation.
Answer: C
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Imagine that a man is scratched by his cat. A phagocyte near the scratch site recognizes and engulfs a bacterium. Shortly thereafter, more phagocytes arrive in the tissue surrounding the scratch. Why? Select all correct choices
A. Other phagocytes are recruited to the scratch site by antigens secreted by the bacteria. B. Other phagocytes are recruited to the scratch site by cytokines produced by the bacteria. C. Other phagocytes are recruited to the scratch site by antigens secreted by the initial phagocyte. D. Other phagocytes are recruited to the scratch site by cytokines secreted by the initial phagocyte.
Which of the following is mismatched?
A. Tinea pedis - ringworm of the foot B. Tinea cruis - ringworm of the groin C. Tinea corporis - ringworm of the body D. Tinea unguium - ringworm of the nails E. Tinea capitis - ringworm of the beard
White fruit color in summer squash is influenced by
a dominant allele W, whereas colored fruit must be ww. In the presence of ww, a dominant gene G results in yellow fruit, and if the individual had both recessive genes in the homozygous condition, it would be green. Give the F2 phenotypic ratios resulting from a cross of a pure-breeding white of genotype WW GG with a green. What will be an ideal response?
Which of the following is the part of a flower that contains the female reproductive structures?
A) carpel B) stamen C) sepal D) petal