Spherical bacteria are known as:
a. gram-negative.
b. spirilli.
c. viruses.
d. cocci.
Ans: d. cocci.
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In five Hfr strains, each of which was used to build a time-of-entry map, the genes entered the recipient cells as follows: Strain 1: S L A C T F Strain 2: N P F T C A Strain 3: T F P N U Y Strain 4: S H Y U N P Strain 5: U N P F T C Which of
the following represents a correct compilation of these results? A) S L A C T F P N H C U B) N P F T S L A C H U T C) T C A L S P N U Y H D) U N P F T C A L S T F E) S L A C T F P N U Y H
Which algal group contains individuals that are typically unicellular and form siliceous shells?
a. diatoms b. red algae c. brown algae d. green algae e. dinoflagellates
How can signal molecules remain outside of cells but still create changes in activity inside cells?
A. Signal molecules act via plasmolysis. B. Signal molecules bind to specific receptor proteins on the outside surface of the plasma membrane. This triggers a chain reaction of events that passes the signal to molecules inside the cell. C. Active transport is required for signal molecules to transmit their signals. D. Signal molecules act through exocytosis.
Which method of microbial control destroys microorganisms by oxidation of cells?
A. use of glutaraldehyde B. incineration C. steam autoclave D. use of UV radiation