Human brains today are about three times the size of the brains of the earliest hominids
a. true
b. false
Answer: a. true
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Which of the following is an advantage of cDNA libraries?
A. cDNA libraries are more stable than other DNA libraries. B. cDNA only contains protein coding exons. C. cDNA libraries utilize genomic DNA, which is relatively easy to obtain. D. cDNA lacks exons. E. cDNA libraries are easy to make.
How does water pass from the root epidermal cells to the xylem in the center of the root?
What will be an ideal response?
The pattern of fever shown in Figure 21.1 is most commonly seen with
A. yaws. B. Lyme disease. C. lymphogranuloma venereum. D. syphilis. E. relapsing fever.
Which of the following definitions best describes an evolutionary arms race?
a. Prey adapts to selection pressure exerted by a predator. b. Prey responds to predation by evolving defensive weapons (e.g., antlers or sharp hooves). c. Prey responds to selection pressure from a predator who in turn responds to the selection pressure exerted by the prey's counter-adaptation. d. Prey responds to selection pressure from a predator by improving its defensive weapons (e.g., antlers or sharp hooves) who in turn responds to the selection pressure exerted by the prey's defensive weapons by better offensive weapons (e.g., longer teeth).