An instrument that magnifies slight differences in the refractive index of cell structures is called a (n) ________ microscope.
A. densitometric
B. electron
C. fluorescence
D. phase-contrast
Answer: D
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The amniotic egg evolved as an adaptation
A. against predation. B. to insure survival in the uterus. C. to prevent desiccation. D. to permit the embryo to develop undisturbed up to the time of hatching.
What do gametes, spores, and gametophyte
generations have in common?
a. They are all diploid. b. They are all haploid. c. They are limited to vascular plants. d. They have nothing in common. e. They are asexual structures
Mutation of the B group gene in Arabidopsis
thaliana affects development in its flower’s a. first whorl only. b. second whorl only. c. third whorl only. d. first and second whorls. e. second and third whorls.
The ligand for nicotinic receptors is acetylcholine.
a. true b. false