The functional barrier between blood and the brain is cerebrospinal fluid
Indicate whether the statement is true or false
FALSE
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Which scenario is not an example of a prezygotic isolating mechanism?
a. An iris blooms at a different time of the year than a daffodil. b. A peacock puts on a different mating display than a sparrow. c. A snail with a shell coiling in one direction cannot mate with a snail whose shell curls in the other direction. d. A zebroid, a cross between a horse and zebra, is sterile. e. One type of roundworm would reject the sperm from another species of roundworm.
Organisms sense and respond to changes both inside and outside the body by way of
a. metabolism.b. photosynthesis. c. receptors. d. catabolism. e. anabolism.
The compound ethylene oxide is used in
A) sanitization. B) sterilization. C) antisepsis. D) degerming. E) disinfection.
Which of the following is the most correct description of the function of reverse transcriptase?
A) It synthesizes a DNA strand from an RNA template, degrades the RNA strand, and replaces the RNA with a new DNA strand. B) It synthesizes an RNA strand from an integrated DNA, then synthesizes the complementary strand to produce a double-stranded RNA. C) It synthesizes a DNA from an integrated DNA template, then synthesizes multiple RNA copies of the newly synthesized DNA molecule. D) It synthesizes an RNA strand from an infecting single-strand RNA then synthesizes multiple RNA copies of both strands. E) It synthesizes a DNA strand from an infecting RNA strand, then uses the DNA as a template for synthesis of multiple new RNA strands.