Which of the following is true of both T cells and B cells?
A. They are effector cells against specific pathogens.
B. They are produced from stem cells of the bone marrow.
C. They can help attack and destroy invading pathogens.
D. They typically have a short life span.
E. All of these statements are true.
E. All of these statements are true.
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Linkage disequilibrium is the tendency for
A. be totally randomized during meiosis. B. be non-randomly associated during meiosis. C. to be rearranged during meiosis because of crossing over. D. link together within certain blocks along the chromosome. E. be so randomized that mapping becomes an issue for gene sequencing.
Ghost crabs predominate in:
a. sandy supratidal. b. sandy intertidal. c. sandy subtidal. d. rocky shores. e. splash zones.
Consider the model for the equilibrium number of species in a mainland (continental) region, as illustrated in Figure 20.23. What does this model say about the rate of speciation?
A) The rate of speciation decreases as a linear function of the number of species. B) The rate of speciation increases as a linear function of the number of species. C) The rate of speciation increases as a function of the number of species, but the rate of increase decelerates as the number of species becomes large.
Which of the following is not a function of the nervous system?
A. perform integration B. generate motor output C. cushion and protect soft tissue D. perform information processing E. receive sensory input