The ratio of ________ in DNA is 1:1.
A) guanine to adenine
B) adenine to thymine
C) cytosine to adenine
D) uracil to cytosine
B) adenine to thymine
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Which of the following terms best describes the forward reaction in the figure?
A) endergonic, ?G > 0 B) exergonic, ?G < 0 C) endergonic, ?G < 0 D) exergonic, ?G > 0 E) chemical equilibrium, ?G = 0
Some members of the Domain Bacteria have
(a) a nucleus. (b) membrane-bound organelles. (c) chloroplasts. (d) photosynthetic ability.
Viruses are isolated from wild-type E. coli cells that have been infected with wild-type bacteriophage ?. These viruses are used to infect a Gal? strain of E. coli. A few bacterial colonies that can grow on galactose are obtained, while no bacteria that can grow on galactose are obtained from cells that were not infected. What has happened?
A) A ? gal+ phage was generated. B) Reversion mutations have occurred. C) The bacteria underwent conjugation with a Gal+ strain. D) The bacteria underwent transformation with a wild-type E. coli strain.
The importance of crustose calcareous algae on a coral reef is that they:
a. provide food for corals. b. prevent settlement of larvae. c. cement bits of rubble in the process of reef formation. d. are a major source of food for reef dwellers. e. create habitat for juvenile fish.