All of the following are methods of disinfection or sterilization, except

A. ethanol.
B. lyophilization.
C. dry oven.
D. triclosan.
E. gamma radiation.


Answer: B

Biology & Microbiology

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After DNA repair enzymes cut out part of a DNA strand that had an incorrect nucleotide, ____ is/are

needed to complete the repair.

a. primase, DNA polymerase, and DNA ligase b. DNA polymerase c. DNA polymerase and DNA ligase d. primase and DNA ligase e. primase and DNA polymerase

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Compared to other genes, the rbcL gene in plants has a mutation rate that is ____ most other plant

genes.

a. slower than b. similar to c. five times faster than d. more random than e. ten times faster than

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Bones move when _____ muscles contract

a. cardiac c. smooth b. skeletal d. all of these

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The DQ is the _____ dose for irradiation of human cells.

a) single-target b) multi-hit c) lethal d) threshold

Biology & Microbiology