___________ destroys vegetative pathogens, but not bacterial endospores.

A) Sterilization
B) Antiseptic use
C) Disinfection
D) Sanitization


Ans: C) Disinfection

Biology & Microbiology

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Bacteria in the genus Salmonella are frequent causes of serious food contamination. Which of the following methods would provide rapid confirmation that a Salmonella species was a contaminant in food suspected of causing food "poisoning"?

A. phage typing B. biochemical tests C. physical characteristics D. analysis of nucleic acids E. serological tests

Biology & Microbiology

The reaction of ethanol fermentation is: pyruvate + NADH ? ethanol + CO2 + NAD+. Why would a yeast need to perform this reaction in the absence of oxygen?

A. To produce CO2 for respiration. B. To produce NAD+ allowing glycolysis to continue. C. NADH is necessary to reduce pyruvate to lactate. D. To produce NAD+ allowing the electron transport chain to run. E. To consume excess pyruvate that cannot enter the Krebs cycle.

Biology & Microbiology

Oxygen concentration generally plays an important role in regulating respiration:

a. all the time. b. never. c. only when the carbon dioxide concentration falls markedly. d. only when the oxygen concentration falls markedly. e. only when the pH falls markedly.

Biology & Microbiology

Is a ribozyme a true enzyme?

a. Yes, because it is a catalyst. b. No, because it is not a protein. c. No, because it cannot catalyze a reaction. d. Yes, because it can synthesize a protein. e. No, because it doesn't require cofactors.

Biology & Microbiology