Refer to Figure 31-1. Asexual reproduction is occurring at point:
A. 1.
B. 2.
C. 4.
D. 7.
E. 9.
D
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Nitrogen fixation:
A. is necessary for the electron-transport chain because nitrogen acts as the final electron acceptor. B. incorporates molecular nitrogen (N2) taken from the air into amino acids and nucleotides. C. releases N2 gas to the atmosphere. D. converts N2 to ammonia, making it available for incorporation into amino acids and nucleotides. E. is carried out by biochemical pathways in the plant cells.
Which receptors allow you to respond to changes in muscle load?
a. muscle spindles b. cupula c. vestibular apparatus d. semicircular canals e. otoliths
The rash of secondary syphilis
A. can last for months. B. does not impair function. C. causes severe itching. D. only lasts a few days. E. is intensely painful.
Which of the following statements about sequence proofreading during DNA replication is false?
(a) The exonuclease activity is in a different domain of the DNA polymerase. (b) The exonuclease activity cleaves DNA in the 5?-to-3? direction. (c) The DNA proofreading activity occurs concomitantly with strand elongation. (d) If an incorrect base is added, it is "unpaired" before removal.