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

Biology & Microbiology

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The photosynthetic membrane of Halobacterium salinarium contains ________.

A. chlorophyll a and b B. bacteriochlorophyll C. bacteriorhodopsin D. archaeochlorophyll

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Natural selection operates directly on

a. the genotype. b. individual alleles. c. the phenotype. d. color only.

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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

Biology & Microbiology

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

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