According to genome analysis, a member of the genus ________ is most closely related to the mitochondrion.
A. Agrobacterium
B. Prochloron
C. Rickettsia
D. Escherichia
Answer: C
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Which region of DNA contains the coding information for a protein in a eukaryote?
A. Exons B. Introns C. Enhancers D. Promoters
In muscle contraction, which of the following
triggers the power stroke?
a. release of Pi from the myosin head b. binding of ATP to the myosin head c. hydrolysis of ATP into ADP and Pi d. cross-bridge formation between actin and myosin e. relaxation of the sarcomere
Which land biome has the greatest primary production?
1.Coniferous forest 2.Temperate grasslands 3.Temperate deciduous forests 4.Tropical forests
Hormones regulate their effects on cells by all of the following EXCEPT:a
negative feedback. b. receptor up-regulation. c. receptor down-regulation. d. signal transduction. e. metamorphosis.