Two researchers suggested in the 1960s that ____ may have been the first informational molecule
a. DNA
b. a protein
c. RNA
d. ozone
e. an amino acid
ANSWER: c
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A scientist looking through a microscope at a piece of shoulder muscle would see which of the following features?
A. striated with unbranched fibers B. striated with branched fibers C. nonstriated with unbranched fibers D. nonstriated with branched fibers E. None of the answers for this question are correct.
Describe the differences between DNA and RNA.
What will be an ideal response?
Blood pressure is the force that drives molecules out of the glomerulus into the Bowman's capsule.
a. true b. false
Some ecologists have proposed that environmental heterogeneity in the tropics leads to greater diversity of trees. Which of the following assumptions underlying this concept seem(s) unlikely?
A) Tropical plants recognize much finer habitat differences in the tropics than they do in temperate regions. B) There is more environmental heterogeneity in the tropics than in temperate regions. C) Both of the above.