Comparisons of human and mouse genomes reveals
A. they have widely different numbers of genes, and share only a few more genes than humans and pufferfish.
B. the differences between humans and mice are mainly the introns.
C. they have very little in common.
D. the genomes are very similar, with most of the genes unique to mice linked to size and shape.
E. the genomes are very similar, with most of the genes unique to mice linked to smell and reproduction.
E. the genomes are very similar, with most of the genes unique to mice linked to smell and reproduction.
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Could an isolated melanin granule move along an actin microfilament?
A. Yes, melanin granules have motor proteins. B. Yes, motor proteins all use ATP to cause a conformation change. C. No, motor proteins are specific for the type of filament they bind. D. Answers a and b are both correct.
Regarding the experiments that "proved" spontaneous generation, which of the following statements is probably true?
a. Air was lacking. b. Too much heat was applied. c. The food source could not support life. d. Microorganisms were already present. e. Excess carbon dioxide was present.
What is the main force by which most of the water within xylem vessels moves toward the top of a tree?
A) active transport of ions into the stele B) evaporation of water through stoma C) the force of root pressure D) osmosis in the root
Which type of cellular transport uses transport proteins and moves substances from an area of high concentration to an area of low concentration?
A) secondary active transport B) primary active transport C) facilitated diffusion D) simple diffusion E) phosphotransferase system