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
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The two image-forming lenses of a compound light microscope are
(a) the condenser and objective. (b) the condenser and the ocular. (c) the objective and ocular. (d) none of these choices.
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.
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.
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.