What are ischial callosities?
a. modified claws that have been flattened into nails
b. a primate’s big toe used for gripping branches
c. thickened skin covering a primate’s buttocks
d. primates’ characteristic rotating shoulder joint
c. thickened skin covering a primate’s buttocks
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Which one of the following is believed to have served as the first electron donor?
A. Mg2+ B. 18O2 C. Fe2+ D. NADPH E. 35S
Protein digestion begins in the
a. mouth. b. stomach. c. small intestine. d. large intestine. e. esophagus
Since all action potentials are essentially the same, how can one differentiate visual and auditory
stimuli? a. The amplitude of each action potential is characteristic of the specific neuron transmitting it to the brain. b. The length of time each stimulus takes to travel to the brain for interpretation varies. c. Receptor potentials are graded. d. Each type of sensory receptor transmits its stimulus to a specific area of the brain for interpretation. e. The frequency of action potentials is characteristic of the specific neuron.
How many prokaryotic species have been grown and studied in the laboratory
A) about 20% of the known species B) all of them C) none of them D) over half of the known species E) less than 1% of the known species