The respiratory surfaces of mammalian lungs are called ____
a. alveoli
b. bronchi
c. tracheae
d. bronchioles
e. air sacs
ANSWER: a
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At any temperature, the metabolic rates of endotherms are always higher than those of ectotherms of comparable size
1.True 2.False
In studies on the pipefish Nerophis ophidion, females are larger than males and appear to be under greater sexual selection pressure than males. The females have two traits that male pipefish of the species lack. What are these two traits?
A) dark blue stripes and lateral spines B) bright orange stripes and skin folds on their bellies C) dark blue stripes and skin folds on their bellies D) lateral spines and skin folds on their bellies
There are several toxins that interfere with synaptic transmission. Botulism toxin, for example, interferes with the fusion of acetylcholine-containing vesicles with the membrane of the axon bulb. This would result in which one of the following?
A) blockage of Ca2+ diffusion into the axon B) slow diffusion of the neurotransmitter across the synaptic cleft C) inability of neurotransmitter to bind the receptor on the postsynaptic membrane D) blocking of neurotransmitter release by the presynaptic membrane E) hyperpolarization of the postsynaptic membrane
Which organism produces a toxin that causes scalded skin syndrome?
a) Streptococcus pyogenes b) Pseudomonas aeruginosa c) Staphylococcus aureus d) Mycobacterium ulcerans