The bacterium Deinococcus radiodurans is able to withstand the damage incurred by exposure to very high levels of ? irradiation. This exposure introduces many double-stranded breaks that are repaired within hours

Which of the following is a key component of this rapid repair mechanism?

A. RecA
B. extended synthesis-dependent strand annealing (ESDSA)
C. synthesis-dependent strand annealing (SDSA)
D. double-strand break repair (DSBR)
E. XerCD


B

Biology & Microbiology

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The two image-forming lenses of a compound light microscope are

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The precipitin test that involves antigen and antibody diffusing toward each other, producing a visible precipitin band at the point at which they meet, is referred to as:

a. double immunodiffusion. b. counterimmunoelectrophoresis. c. particle agglutination. d. enzyme immunoassay.

Biology & Microbiology

The sputum of a 75-year-old man with chronic lung infections yields the following: • Many gram-negative coccobacilli in Gram stain • X and V factors required for growth • Nonhemolytic on rabbit blood agar The organism can be identified as:

a. Haemophilus aegyptius. b. H. parainfluenzae. c. Haemophilus haemolyticus. d. H. influenzae.

Biology & Microbiology

A very agile seabird used in Japan to help catch fish is called:

a. a stilt. b. a albatross. c. a cormorant. d. a gull. e. an oystercatcher.

Biology & Microbiology