The first photosynthetic organisms to obtain hydrogen by splitting water were the cyanobacteria
______________ Indicate whether the statement is true or false.
True
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If a mutated DNA sequence produces a protein that differs in one central amino acid from the normal protein, which of the following kinds of mutations could have occurred? View Available Hint(s) If a mutated DNA sequence produces a protein that differs in one central amino acid from the normal protein, which of the following kinds of mutations could have occurred?
a. A deletion mutation. b. An addition mutation c. None. d. An addition mutation and a deletion mutation.
Reptiles resemble __________ in being able to
__________. a. ray-finned fishes; freely leave the water b. birds; breathe by use of lungs c. ostracoderms; utilize their jaws d. amphibians; exchange gases across their skin e. lobe-finned fishes; exchange gases across their gills
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.
When light strikes the rod cell, it becomes ________ and glutamate release onto bipolar cells ________.
A. excited; increases B. depolarized; increases C. hyperpolarized; decreases D. hyperpolarized; increases E. depolarized; decreases