Which part of the digestive tract has the lowest pH?
A) Small intestine
B) Stomach
C) Rectum
D) Large intestine
E) Pancreas
B
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Negri bodies are produced within ________ of rabies-infected humans.
A. the skin B. brain neurons C. connective tissue D. skeletal muscle
Humans perceive the taste sensations of
a. sweet. b. salty. c. bitter. d. umami. e. all of these.
Currently the only predators of Galápagos marine iguanas are Galápagos hawks. Iguana body size is not correlated with risk of hawk predation, although small iguanas can sprint faster than large iguanas
If predators (for example, cats) that preferably catch and eat slower iguanas are introduced to the island, iguana body size is likely to _____ in the absence of other factors; the iguanas would then be under _____ selection. A) increase; directional B) increase; disruptive C) decrease; directional D) decrease; disruptive
In seedcracker finches from Cameroon, small- and large-billed birds specialize in cracking soft and hard seeds, respectively. If long-term climatic change resulted in all seeds becoming hard, what type of selection would then operate on the finch population?
A) disruptive selection B) directional selection C) stabilizing selection D) sexual selection E) No selection would operate because the population is in Hardy-Weinberg equilibrium.