The lipids within the fluid mosaic of the plasma membranes are held in place by:
A) covalent bonds.
B) hydrogen bonds.
C) ionic bonds.
D) disulfide bridges.
E) hydrophobic interactions.
E) hydrophobic interactions.
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Which of these events happens first in nearly all seed germination?
A) The cotyledons appear above ground, turn green, and photosynthesize. B) The radicle emerges from the seed, which permits the uptake of water and nutrients from the soil. C) The hypocotyl elongates to lift cotyledons above ground. D) Lateral roots develop and expand into surrounding soil.
A genetic mutation may be passed on to offspring if the mutation occurs in what type of cell?
a. a cancerous cell b. a dividing cell within the body c. a somatic cell d. an egg or sperm cell e. any cell in the organism
Why do populations evolve?
a. Populations evolve because they want to. b. Populations evolve because they need to. c. Populations evolve because of natural selection. d. Populations evolve because of speciation.
Social insect colonies are composed of highly specialized groups called what?
A. clines B. ecotypes C. castes D. species E. filial relatives