The period in the cell cycle when deoxyribonucleic acid (DNA) is synthesized is:

a. G1
b. S
c. G2
d. M

ANS: B
DNA is synthesized during the S phase of the cell cycle.

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Which of the following are gases that turn into liquid at or below -130°F (-90°C) at 14.7 psi (101 kPa) {1.01 bar}?

A. Cryogens B. Liquefied gases C. Frozen materials D. Elevated-temperature materials

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Which of the following is a recommended deposition rate for PDL injections?

A) 0.1 mL over 20 seconds or slower B) 0.1 mL over 30 seconds or slower C) 0.2 mL over 20 seconds or slower D) 0.2 mL over 40 seconds or slower

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