The sequence of amino acids specified by this mRNA (AUGCGUCCA) is
a. serine - histidine - lysine.
b. methionine - arginine - proline.
c. methionine - alanine - serine.
d. valine - arginine - leucine.
e. valine - proline - methionine.
ANSWER: b
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The movement of substances from higher to lower concentration across a semipermeable membrane via a specific protein carrier but without energy expenditure is called ________.
A. active transport B. endocytosis C. facilitated diffusion D. diffusion E. osmosis
The most significant cells in graft rejection are
A. helper T cells. B. suppressor T cells. C. cytotoxic T cells. D. natural killer (NK) cells. E. delayed hypersensitivity T cells.
Serological analysis for bacterial identification typically involves using
A. methods to identify cell enzymes. B. the analysis of the appearance of colonies. C. specific antibodies to the bacterial cell antigens. D. a microscope to determine cell morphology. E. the determination of guanine + cytosine base concentrations.
The descriptive groupings of virus into categories such as icosahedral and helical are based on
A. the presence or absence of an envelope. B. the type of nucleic acid. C. the shape of the nucleocapsid. D. the mechanism of entry into host cells.