What determines whether a honeybee becomes a queen or a worker?
A. Hormonal secretions
B. Location in the hive
C. Pheromones
D. Diet
E. Genetic differences
Answer: D
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Long, slender, helically curved, gram-negative bacilli with hooked ends are identified as belonging to which species?
a. Treponema b. Leptospira c. Borrelia d. Coxiella
The biological basis of nicotine addiction is that nicotinic receptors bind
A) nicotine molecules and the neurotransmitter acetylcholine. Binding releases dopamine, which causes pleasurable feelings. B) postsynaptic receptors that normally bind endorphins. C) the dopaminergic receptor, releasing acetylcholine, which causes the pleasurable feelings. D) the pleasure center in the brain.
What structure in most ray-finned fish is responsible for buoyancy control?
a. Gas gland b. Blubber c. Squaline d. Swim bladder
Which of the following statements concerning the heart is false?
a. It is an organ. b. It contains endothelium. c. It contains nerves
d. It is an organ system. e. Its muscles contain elongated fibers.