At the conclusion of S phase, a diploid cell with 40 chromosomes will have ____ chromosomes and _____ sister
chromatids.
a. 20; 40
b. 20; 20
c. 40; 40
d. 40; 80
e. 80; 80
ANSWER: d
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Which biomes tend to have the deepest layers of topsoil?
a. Grasslands b. Deciduous forests c. Deserts d. Coniferous forests e. Tropical rainforests
A seed is a _____
a. female gametophyte c. mature pollen grain b. mature ovule d. modified microspore
All of the following are part of a prokaryotic cell except
a. DNA. b. a cell wall. c. a plasma membrane. d. ribosomes. e. an endoplasmic reticulum.
When imbalances occur in the sex ratio of sexual species that have two sexes (that is, other than a 50:50 ratio), the members of the minority sex often receive a greater proportion of care and resources from parents than do the offspring of the
majority sex. This is most clearly an example of _____. A) sexual selection B) balancing selection C) stabilizing selection D) frequency-dependent selection