A genetic signature for positive selection is
A) a gene sequence present in humans and other primates, but with at least one amino acid difference in the encoded protein in humans.
B) a gene that is unique to humans.
C) a gene sequence present in humans and other primates, but with no amino acid sequence differences.
D) a gene that encodes a protein that makes the individual more sexually attractive.
A) a gene sequence present in humans and other primates, but with at least one amino acid difference in the encoded protein in humans.
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During the light reaction water is oxidized to form oxygen. This process
A. yields low-energy electrons. B. yields high-energy electrons. C. is needed to replace the electron lost by P680 during the light reaction. D. yields low-energy electrons and is needed to replace the electron lost by P680 during the light reaction. E. yields high-energy electrons and is needed to replace the electron lost by P680 during the light reaction.
Each amino acid is encoded by only one mRNA codon
a. True b. False Indicate whether the statement is true or false
Cells involved in the contractions of the heart are called
A. skeletal muscle cells. B. cardiac muscle cells. C. smooth muscle cells. D. fibroblasts. E. chondrocyte cells.
Which of the following statements is false about
human chorionic gonadotropin? a. It is initially secreted by the blastocyst. b. It stimulates the corpus luteum to continue secreting progesterone and estrogens. c. Once it forms, the placenta secretes the hormone. d. It prevents the uterine lining from sloughing off. e. The earliest it can be detected in the urine is seven weeks after conception.