Which of the following enzymes is found ONLY in hyperthermophiles?

a. topoisomerase I
b. reverse DNA gyrase
c. helicase
d. DNA polymerase III


Answer: B

Biology & Microbiology

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Which of the following statements are true of CAM photosynthesis? (Select all correct answer options.)

A. The Calvin cycle is active during the day. B. Organic acids are decarboxylated at night. C. Organic acids are decarboxylated in daylight. D. CO2 capture and fixation occur at different times. E. CO2 capture and fixation occur in different cells.

Biology & Microbiology

When testing the effectiveness of a new cleaning product, which sample would be more valid? a. 222 bacteria in the Petri dish b. None of the samples are valid

c. 14 bacteria in the Petri dish d. All samples are equally valid. e. 3 bacteria in the Petri dish

Biology & Microbiology

All flatworms use their skin as a respiratory organ

Indicate whether the statement is true or false

Biology & Microbiology

In Figure 8.1, which colonies are streptomycin-resistant and leucine-requiring?

A) 1, 2, 3, and 9 B) 3 and 9 C) 4, 6, and 8 D) 4 and 8 E) 5 and 6

Biology & Microbiology