What happens when a culture is incubated above the organism's maximum temperature for growth?
a. The cell continues to grow at the normal rate.
b. The cells grow much faster than normal because the enzymatic reactions are occurring at a much faster rate.
c. The cell membranes collapse, proteins denature, and the cell usually dies.
d. The transport of nutrients into the cell is slow; therefore, the cells grow more slowly than normal.
Answer: C
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The poliomyelitis virus appears to selectively destroy
A. sensory nerve cells. B. mixed nerve cells. C. autonomic nerve cells. D. motor nerve cells.
Which of the following statements about cellular metabolism is FALSE?
A) Glycolysis is inhibited when cellular energy levels are abundant. B) Citric acid cycle activity is dependent solely on availability of substrate; otherwise it is unregulated. C) In the electron transport chain, electrons decrease in energy level as they are transferred from one electron carrier to the next. D) Reactions of the citric acid cycle take place in the mitochondrial matrix.
Cultures of genetically identical cells are called ____
a. bacteriophages b. clones c. prophages d. prions e. auxotrophs
A researcher is studying the synthesis of a specific amino acid found in Neurospora. She knows that the pathway begins with a precursor that is converted into the amino acid with two known intermediates (Substance Blue and Substance Green). She
accurately predicts that this amino acid synthesis pathway is catalyzed by three enzymes, (I, II, and III). She subsequently identifies three mutants that she calls Mutant I, Mutant II, and Mutant III. With the information about the mutants below place the enzymes in the order that the enzymes act in this pathway. (Note: the numbers I, II, and III don't necessarily indicate the order in which the enzymes appear.) Mutant I (only Enzyme I is mutated) is unable to synthesize the amino acid even if she provided the mutant with both Substance Blue and Substance Green. Mutant II (only Enzyme II is mutated) is able to synthesize the amino acid if she provided the mutant with Substance Blue or Substance Green. Mutant III (only Enzyme III is mutated) is able to make the amino acid if she provided the mutant with Substance Green, but not if she provided the mutant with only Substance Blue. A) II, I, III B) III, II, I C) III, I, II D) I, II, III E) II, III, I F) More than one codon can specify a given amino acid.