Which of the following organisms is an ectotherm?
a. elephant
b. lizard
c. owl
d. bat
e. human
B
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To maintain adequate nutrition, animals require dietary access to certain amino acids. An amino acid that is not "essential" would be best described as one that _____
A) can be made by the animal's body from other substances B) is not used by the animal in biosynthesis C) must be ingested in the diet D) is not readily absorbed by the gastrointestinal tract E) is not found in many proteins
Oxygen-16 is abundant and has 8 protons and 8 neutrons. Oxygen-18 has two extra neutrons. These two forms are:
A. oxygen ions. B. oxygen dimers. C. oxygen isomers. D. oxygen isotopes.
In their studies of "ant plants," the scientists in Investigating Life 22.5 were testing what hypothesis?
A. The tramp ants were pollinating the trees. B. The tramp ants promote fruit production in trees with the domatia. C. Other species of ants were competing with the tramp ants for nectar. D. The tramp ants were parasites eating nectar from the trees. E. Trees in good locations have enough energy to both produce food and feed ants.
Which of the following is the most difficult to inactivate?
A) enveloped viruses B) fungus spores C) bacterial endospores D) nonenveloped viruses E) protozoan cysts