Of the following molecules, which would not be expected to be moved across a membrane by simple diffusion?
A) oxygen
B) fatty acids
C) water
D) glucose
E) dimethylurea
D) glucose
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In 2006, scientists discovered a fossil that had scales and gills, a flat head with eyes on top like a crocodile, and fin and neck bones that would allow it to prop itself out of the water. The best explanation for this fossil is that it is
A. a transitional fossil between fish and amphibians. B. a transitional fossil between amphibians and reptiles. C. a ray-finned fish. D. a modern amphibian.
Why do diabetes patients often display tissue degeneration in the extremities?
a. The body is unable to process enough glucose and therefore supports only the major organs. b. The fat deposits protecting the extremities are utilized as an energy source. c. The body utilizes protein as an energy source, weakening blood vessels , especially those in the extremities. d. The unutilized glucose in the extremities crystallizes and damages these tissues. e. The excess exercise used to control the diabetic condition causes tissue degeneration.
Unlike in animal meiosis, meiosis in plants gives rise to
a. diploid spores. b. haploid spores. c. diploid gametes. d. haploid gametes. e. cells without walls.
The most diverse, successful, and familiar group of plants today are the:a
ferns. b. lycopods. c. bryophytes. d. angiosperms. e. gymnosperms