DNA is believed to have replaced RNA as the main information molecule because _____
a. DNA contains thymine and RNA does not.
b. DNA is double-stranded and breaks less easily.
c. DNA can store more protein-building instructions in less space.
d. RNA can also function as an enzyme.
e. RNA can regulate gene expression.
ANSWER: b
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The organisms that most specifically utilize light energy to make organic molecules from inorganic molecules are
A. photohemitrophs. B. heterotrophs. C. photoisotrophs. D. photoautotrophs. E. photoheterotrophs.
The proportion of individuals in a population expressing a trait when they have the appropriate
genotype represents the percent of ____________________ for the trait. Fill in the blank(s) with the appropriate word(s).
Radiation and chemotherapy are the best treatments for cancer because they are very specific and destroy only
cancerous cells. a. True b. False
Consider a collection of 50 alleles that segregate in a population. The waiting time to the first coalescent event will be shortest:
a. if ? is = 0.0000001 b. if s = 0.15 c. if Ne = 100 d. if Ne = 100,000 e. if Ne = 1,000,000