Typically, the __________ an animal becomes, the less likely it is that it can meet its oxygen
demands by diffusion across the body surface.
a. larger
b. smaller
c. more developed
d. less active
A
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Which of the following is required if a researcher wants to analyze genes in different species for their homologies?
A. relatively short DNA sequences B. relatively short RNA sequences C. relatively long DNA sequences D. relatively short polypeptide sequences E. relative differences in a species' metabolomics
What is the most reasonable conclusion that can be made from data graphed in the figure?
A. After high mortality early in life, survivorship becomes constant for the rest of life.
B. Survivorship is constant throughout life.
C. After low mortality early in life, mortality increases to a constant rate for the rest of life.
D. After following a constant rate early in life, mortality becomes low late in life.
Small, nonterritorial male marine iguanas typically have their mating interrupted by larger males prior to ejaculation. What alternative mating strategy have these small males developed to compensate for this?
A) Small males form coalitions and distract larger males to allow enough time for copulation. B) Small males induce ejaculation prior to copulation, and store the ejaculate in their cloacal pouches. C) Small males have developed the ability to induce ejaculation much more quickly than large males. D) Small males have developed sperm that are more efficient at fertilization than the sperm of larger males.
Which of the following functions like a fence to block membrane protein movement between the apical and basolateral regions of an intestinal epithelial cell plasma membrane?
A) gap junctions B) desmosomes C) adherens junction D) hemidesmosomes E) tight junction