What is a passive process that requires a protein for movement of a solute across a membrane?
a. active transport
b. endocytosis
c. bulk flow
d. facilitated diffusion
e. osmosis
d
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Sometimes ________ beams are used to irradiate foods in place of gamma radiation because the process does not generate radioactive waste.
A. electron B. magnetic C. microwave D. None of the choices are correct.
The structure that gets smaller and smaller as one progresses from bryophytes to vascular plants, then
seed plants, is the
a. sporangium. b. sporophyte. c. gametophyte. d. sperm cells. e. eggs.
Which portion of the testes produces sperm?
a. Leydig cells b. interstitial cells c. epididymis d. seminiferous tubules e. Sertoli cells
In the multiple allelic system for eye color in Drosophila, the phenotypic expression of the alleles depends on
A) how much pigment is produced by the alleles present. B) the interaction of alleles from two different genes. C) the temperature at which the flies are grown. D) the sex of the fly. E) Both A and B