The outward-facing cell walls of epidermal cells are
filled with which of the following to reduce water
loss?
a. cutin
b. pectin
c. lignin
d. suberin
e. chitin
Answer: a
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A complication of molecular clock studies is that
A) DNA and proteins appeared in life at about the same time. B) genes mutate at different rates. C) DNA is not often preserved in fossils. D) some species are more highly evolved than others.
An understanding of the biology of marine animals is needed in order to implement adequate management of marine fisheries
Indicate whether the statement is true or false
The phospholipid molecule represented in the figure
above a. has a hydrophobic head labeled B and a hydrophilic tail labeled A. b. has a hydrophilic head labeled A and a hydrophobic tail labeled B. c. does not contain a phospholipid. d. contains only a hydrophobic segment. e. contains only a hydrophilic segment.
A restriction enzyme cuts DNA and leaves the following end: CTGCA G Which of the following could be the sequence of the corresponding end of the other fragment generated by the enzyme?
A) G CTGCA B) C GTGCA C) CCGAT G D) GGCTA C E) None of these