During penetration of E. coli by the T4 phage

A. lysozyme is used to allow entry of the phage capsid.
B.
the tail acts as a "hypodermic needle," injecting the phage DNA into the cell.

C. the protein fibers digest a hole in the cell wall.
D. the bacterial receptor molecules open a hole through the cell wall.


B

Biology & Microbiology

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Decontaminating and disinfecting surfaces may result in a decreased removal of contaminating organisms when used in combination. This is due to the fact that:

a. agents are all synergistic and should not be of concern in the laboratory. b. agents mixed together may actually inac-tivate each other or create harmful chem-icals resulting in additional hazards. c. agents are antagonistic and will not be as effective. d. agents are already premixed to maximize sterilization.

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Peripheral vascular diseases are disorders of the blood vessels that are located outside of the heart and brain.

Answer the following statement(s) true (T) or false (F)

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Fats high in unsaturated fatty acids tend to be solid at room temperature

__________________ Indicate whether the statement is true or false.

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Which of the following microscopes uses visible light?

a. Scanning electron microscope b. Confocal microscope c. Scanning acoustic microscope d. DIC e. Fluorescence microscope

Biology & Microbiology