The classification/identification system in the text uses this sequence of characteristics to group viruses:
A) host organism, capsid type, envelope presence/absence
B) nucleic acid type, envelope presence/absence, double- vs. single-stranded nucleic acid
C) nucleic acid type and strandedness, envelope presence/absence, host organism
D) viral size, shape of capsid, host organism
Ans: B) nucleic acid type, envelope presence/absence, double- vs. single-stranded nucleic acid
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a. amyloplasts b. calcium carbonate crystals c. nuclei d. vacuoles e. hormones
Which of the following is NOT an adaptation used by marine mammals to extend dive times?
a. size-relative increase in blood volume. b. increase in erythrocyte count c. size-relative increase in lung volume d. elevated concentration of muscle myoglobin e. reduced circulation to nonessential organs
The neurotransmitter acetylcholine is released by neurons at the neuroeffector synapse?
A. True only for the sympathetic division B. True only for the parasympathetic division C. True for both divisions
The pleural cavity is located:a
between the pleural membranes. b. inside the innermost pleural membrane. c. outside the outermost pleural membrane. d. between the right lung and the left lung. e. within the bronchioles.