Which statement is correct regarding microbial growth on food at refrigeration temperatures?
A. The absence of light in the refrigerator greatly reduces the growth of most microbial pathogens.
B. There is no growth of microbes in food in the refrigerator; the cold temperature kills or inactivates microbial cells.
C. Most food does not have enough oxygen content for microorganisms to thrive.
D. The growth of microbes in food depends on their optimal growth temperature; some grow slowly and others faster.
Answer: D
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Dissolved oxygen content in stream water is affected by
(a) organic matter in the water. (b) overgrowth of algae. (c) water nutrient levels. (d) all of the above.
The "charging" or activation of a tRNA molecule includes:
A. the covalent attachment of an amino acid to the 3'-terminal cytosine of the tRNA. B. the covalent attachment of the amino group of an amino acid to the tRNA. C. the covalent attachment of the carboxyl group of an amino acid to the tRNA. D. the covalent attachment of an amino acid to the 5'-terminal adenosine of the tRNA.
Microorganisms that live on dead and decaying organic material are known as
A) indigenous microflora. B) parasites. C) pathogens. D) saprophytes.
Which of the following is not associated with a bacterial ribosome?
A. Its small subunit provides the enzymes for making peptide bonds. B. It is a 70s holoenzyme. C. It has a peptide (P) site. D. It has an exit site. E. It has an amino acid (A) site.