Endorphins are ____
a. neuromodulators only
b. stimulators of brain and nervous activity only
c. inhibitors of pain perception only
d. neuromodulators and stimulators of brain and nervous activity
e. neuromodulators and inhibitors of pain perception
ANSWER: e
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I) spleen II) thymus III) bone marrow A) only I and III B) only I and II C) only II and III D) I, II, and III
The ENCODE project has shown that much of human genomic DNA:
A. encodes protein. B. forms telomere and centromeres. C. regulates the expression of protein coding genes. D. is simple-sequence repeats. E. is not transcribed.
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a. biogeochemical mechanisms for their removal have not yet appeared in the biosphere. b. they combine with water to form hydrochloric and hydrofluoric acids. c. they are found in smog. d. they are photochemical oxidants. e. they combine with carbon dioxide to form acid rain.
Hemoglobin transports oxygen in the blood and consists of a chain of 146 amino acids. How many different types of amino acids are used to construct proteins?
A. 146 B. 2 C. 20 D. 200