Which of these examples represents a gene family?
A) A genome includes many genes that encode myosin motor proteins.
B) All of the genes that are required for gamete formation in humans.
C) A gene encoding a kinase is similar in humans, chimps, and mice.
D) A genome includes many pseudogenes.
E) All of the genes that are expressed in a single tissue.
A) A genome includes many genes that encode myosin motor proteins.
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Natural selection acting on a population may NOT favor
a. individuals at the left end of the range of variation. b. individuals at the right end of the range. c. extreme individuals at both ends of the range. d. the intermediate individuals within the range. e. obligate asexually reproducing organisms.
Receptors in the human nose are
a. chemoreceptors. b. mechanoreceptors. c. photoreceptors. d. nociceptors. e. none of these.
Willow trees and many other plants produce ________, from which aspirin is made
A) nicotine B) acetaminophen C) salicylic acid D) volantin E) acetic acid
RNA is believed to have preceded DNA because _____.
A. DNA contains thymine and RNA does not. B. DNA is double stranded and requires more components. C. DNA can store more protein-building instructions in less space. D. RNA can also function as an enzyme. E. RNA cannot replicate itself.