Which of the following is NOT true of ecosystems?
a. Although they may include many different
species, many features of ecosystem structure
and function are alike.
b. Autotrophs secure energy and nutrients that are
then used by heterotrophs.
c. Energy cycles and minerals flow through
ecosystems.
d. Many different food chains are represented in
most ecosystems.
e. Ecosystems are characterized by relatively few
trophic levels
Answer: c
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When 10,000 molecules of ATP are hydrolyzed to ADP and i in a test tube, about half as much heat is liberated as when a cell hydrolyzes the same amount of ATP. Which of the following is the best explanation for this observation?
A) Cells are open systems, but a test tube is an isolated system. B) Cells are less efficient at heat production than nonliving systems. C) The hydrolysis of ATP in a cell produces different chemical products than does the reaction in a test tube. D) The reaction in cells must be catalyzed by enzymes, but the reaction in a test tube does not need enzymes. E) Reactant and product concentrations in the test tube are different from those in the cell.
The last intermediate produced in the Krebs cycle is ____
a. pyruvate b. acetyl CoA c. fructose bisphosphate d. oxaloacetate e. citrate
Messenger RNA is:
a. information copied or transcribed from DNA. b. comprised of rRNA. c. comprised of tRNA. d. referenced by DNA. e. used by cells to communicate with each other.
The protein-coding genes of chloroplasts are involved in what part of photosynthesis?
What will be an ideal response?