Individuals with xeroderma pigmentosum inherit a faulty DNA repair mechanism. As a consequence, ____
a. they are sterile
b. their cells have no proofreading abilities during DNA replication
c. Okazaki fragments produced during DNA replication cannot be joined
d. they easily develop skin cancer when exposed to sunlight
e. their telomeres are shorter than average
ANSWER: d
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Maintenance of the body's internal environment at relatively constant levels is called ____
a. feedback b. homeostasis c. physiology d. natural selection e. feedforward
The term infection refers to
A. microorganisms colonizing the body. B. contact with pathogens. C. contact with microorganisms. D. pathogens penetrating host defenses.
The amphibians are believed to have arisen from ancestral:a
chondrichthyean fishes. b. actinopterygian fishes. c. reptiles. d. sacropterygian fishes. e. amphibians.
Which heterotrimeric G proteins function by inhibiting adenylyl cyclase?
a) Gi family b) Gq family c) Gr family d) G12/13 family e) Gs family