A neuropeptide that functions as a natural analgesic is _____
A) acetylcholine
B) epinephrine
C) endorphin
D) nitric oxide
E) gamma-aminobutyric acid (GABA)
Answer: C
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The photosynthetic membrane of Halobacterium salinarium contains ________.
A. chlorophyll a and b B. bacteriochlorophyll C. bacteriorhodopsin D. archaeochlorophyll
Natural selection operates directly on
a. the genotype. b. individual alleles. c. the phenotype. d. color only.
The CORRECT sequence of events occurring during transcription is ________
A) splicing, capping, tailing B) initiation, elongation, termination C) tailing, capping, splicing D) elongation, initiation, termination
Which of the following definitions is INCORRECT?
A) acute: a short-lasting primary infection B) inapparent: infection characteristic of a carrier state C) chronic: a disease that develops slowly and lasts for months D) primary infection: an initial illness E) secondary infection: a long-lasting illness