A compound which stabilizes pH by absorbing or releasing H+ ions is called a(n)
A) salt. B) buffer. C) base. D) acid. E) solute.
Answer: B
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Human pathogens of the genus Encephalitozoon belong to the ________.
A. Microsporidia B. Chytridiomycota C. Urediniomycetes D. Glomeromycota
Why is there a wide variation in skin color in humans?
A. Crossing-over increases the rate of color variation. B. Skin color is a polygenic trait. C. Environmental changes like improvements in diet change the color of the skin over time. D. Artificial selection causes variation in skin color. E. Genetic drift selects for genes that blend skin colors.
In plants, which of the following cells is (are)
diploid?
a. egg cell b. sperm cell c. spore cell d. root cell e. all of these cells are haploid
When comparing the gene coding for cytochrome c in several species, it was noted that humans and
chimpanzees share the identical amino acid sequence with a change in only one location. This means that a. humans and chimpanzees can mate and produce viable offspring. b. humans evolved from chimpanzees. c. over time, chimpanzees will eventually evolve into primitive humans. d. humans and chimpanzees are closely related in evolutionary time. e. there is nothing particularly informative about this discovery.