The human body must maintain a constant pH. In the blood, bicarbonate serves as a(n) ________ to help maintain the necessary pH
A) acid B) buffer C) solvent D) base
B
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What kind of immune responses do insects have?
A) innate immunity only B) innate and adaptive immunity similar to that of vertebrates C) adaptive immunity only D) They have innate and adaptive immunity, but the adaptive immune system has fewer cells than that of vertebrates.
In which pair of organisms would you predict the DNA sequences of the ?-globin gene family are the most similar?
A. dolphin and bumble bee B. catfish and crocodile C. snake and mouse D. frog and cheetah E. human and chimpanzee
tRNA genes account for ________ percent of the human genome.
A) 0.001 B) 0.01 C) 0.1 D) 1
Modern oceanography and marine biology were attributed to:
a. the voyage of the Beagle. b. the discoveries of Alvin. c. the laying of the transatlantic telegraph cable. d. expeditions of Alexander Agassiz. e. the Challenger expedition.