Thorough mixing of oxygen and nutrients
within lakes in temperate regions occurs in
a. winter and summer.
b. winter and spring.
c. spring and summer.
d. spring and autumn.
e. summer and autumn
D
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A bacterium that uses CO2 as an electron source but CANNOT use it as a carbon source is considered a mixotroph
Indicate whether the statement is true or false.
Unstable isotopes can be useful
A) catalysts. B) in medical diagnosis. C) in vitamins. D) in the formation of hydrogen bonds. E) as buffers.
Why was the advent of the amniotic egg so important in the evolution of terrestrial vertebrates?
A. It made internal fertilization more likely, so it increased individual species' fitness. B. It completely removed dependence on water for reproduction. C. It reinforced pre-zygotic isolating mechanisms. D. It increased the number of offspring an individual female could have.
The electrical stimulus for each human heartbeat begins in the ____ at the _____ node.
A. right atrium, sinoatrial. B. left atrium, sinoatrial. C. right atrium, atrioventricular. D. right ventricle, atrioventricular. E. pulmonary trunk, sinoatrial.