The streamlined shape of the dolphin, seal, and other swimming animals is most important for
A. overcoming the forces of gravity acting on the animal.
B. reducing the mass of the animal's body.
C. maintaining a consistent speed in the dense medium.
D. reducing drag from the water they must swim through.
D. reducing drag from the water they must swim through.
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Because DNA:DNA hybridization reveals subtle differences in genes, it is useful for differentiating organisms from different
A) domains. B) families. C) orders. D) strains or species.
___________ conditions are essential in a Southern blot experiment if the researcher wants to identify the closest DNA match to the probe
A. High stringency B. Low stringency
Which of the following statements about the botulism toxin is NOT true?
a. It is an exotoxin. b. It is produced by the bacterium Clostridium. c. It may be found as a contaminant in poorly prepared food. d. Its brand name is Botox. e. It causes muscles to contract.
Which of the following contributes to the semen?
A. penis B. bulbourethral gland C. epididymides D. urethra E. vas deferens