The movement of chemicals through ecosystems is known as
A. community ecology.
B. biogeochemical cycling.
C. biomagnification.
D. global warming
E. pollution
Answer: B
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The pathway of metabolism that involves a series of electron transfers from reduced carrier molecules such as NADH2 and NADPH2 to a terminal electron acceptor is:
a. substrate-level phosphorylation. b. fermentative metabolism. c. oxidative phosphorylation. d. aerobic respiration.
Which of the following statements most likely
apply to the earliest cells?
a. They were prokaryotic cells. b. It is likely that earliest cells did not have a nucleus but had membrane-bound organelles. c. The earliest cells may have used oxygen gas in order to thrive successfully. d. Energy from the sun may have been used by the earliest cells. e. All of these statements most likely apply
What are the three elements that are most often limiting factors for plant growth?
a. carbon, potassium, and magnesium b. carbon, oxygen, and nitrogen c. hydrogen, magnesium, and oxygen d. sulfur, calcium, and nitrogen e. nitrogen, phosphorus, and potassium
The condition that some organisms contain much larger amounts of DNA than are apparently "needed" and that some relatively closely related organisms may have vastly different amounts of DNA is more typical in ________
A) RNA viruses than in DNA viruses B) the alphoid rather than the diploid family C) eukaryotes than in prokaryotes D) prokaryotes than in eukaryotes E) viruses than in bacteria