The citric acid cycle contains how many steps?
a. 2
b. 4
c. 6
d. 8
d. 8
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Why should humans consider eating “lower on the food chain”?
a. We digest and assimilate plant material more efficiently than meat. b. We digest and assimilate meat more efficiently than plant material. c. Many regions exist that support vegetation suitable only for feeding large herbivores.
d. Energy efficiency is greater when passed through fewer trophic levels. e. No biological reaction is 100% efficient.
Which of these hypotheses cannot be tested by an experiment?
a. Biological interactions between barnacle species are responsible for their distribution patterns. b. Night-feeding fishes rely on their sense of smell to locate prey. c. The growth of salt marsh grass is limited by nitrogen availability. d. Certain humpback whale behaviors are important for attracting a mate. e. Goldfish prefer to eat brightly-colored foods.
Recombination frequency differs between males and females. Which sex has a higher rate of recombination, heterogametic (males) or homogametic (females)?
What will be an ideal response?
In animals with a closed circulatory system, gas exchange occurs across the thin walls of ________
A) arteries B) arterioles C) capillaries D) venules