Nitrogen-fixing bacteria receive _______ from the plant in a mutually beneficial relationship.
Fill in the blank(s) with the appropriate word(s).
sugar
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Which of the following damaged templates encountered by a replication fork is repaired by double-strand break repair?
A. The replication fork encounters a lesion and translesion synthesis occurs. B. The replication fork encounters a lesion and stalls. C. The replication fork encounters a lesion and bypasses it, restarting synthesis on the other side of the lesion. D. The replication fork encounters a lesion at which repair has been initiated and the fork collapses. E. The replication fork encounters heteroduplex DNA.
How is pollentube elongation facilitated?
a. Pollen tube growth relies onchemical signals released by the pollen grain. b. Pollentube elongation will occur as long as the pistil provides moisture and energy. c. Chemical cues from female tissues help guide pollen tube growth, but the identity of these chemicals is not known. d. All the details of the chemical interactions between the pollen tube and pistil tissue have been elucidated and are well-described. e. Pollentube elongation occurs only in the absence of chemical cues from the female tissues.
Each of the following could be the terminal electron acceptor in anaerobic respiration except
A) O2. B) sulfur. C) protons. D) iron. E) All could serve as the terminal electron acceptor in anaerobic respiration.
A flexible, spiral-shaped bacterium is called a
A) spirochete. B) vibrio. C) coccobacillus. D) spirillum. E) sarcina.