Fall leaf color on deciduous trees is a result of
A. cessation of chlorophyll production, which allows the accessory pigments to be revealed.
B. the reduction in the production of accessory pigments.
C. the production of more accessory pigments because of the cooler temperatures.
D. the increased angle of the sun during the fall, which reflects more of the accessory pigments.
Answer: A
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A) ions that can regulate heartbeat B) amino acids C) nucleotides D) ribosomes
Which of the following does not result in increased genetic diversity?
A. All of the answer options would result in increased genetic diversity. B. recombination of alleles between homologous chromosomes during meiosis C. random sorting of homologous chromosomes into different gametes during meiosis D. fusion of unique gametes during fertilization E. conjugation in prokaryotes
Allosteric inhibitors are often ____
a. substrates of the reactions they regulate b. products of the reactions that they regulate c. charged amino acids in the active site d. large, complex organic molecules e. competitive inhibitors
Which of the following is not a major defining chordate characteristic?
a. blocks of muscles from myomeres b. a pair of eyes at the anterior c. a hollow, dorsal nerve cord d. a notochord e. a tail extending beyond anus