12. Unlike a disinfectant, an antiseptic: A. sanitizes, rather than sterilizes.
ID: 218325 • Letter: 1
Question
12. Unlike a disinfectant, an antiseptic: A. sanitizes, rather than sterilizes. B. destroys all microorganisms. C. is nontoxic enough to be used on human skin. D. requires heat to be effective. E. can be used in food products. 13. Each glucose made in the dark reactions of photosynthesis requires this # of ATP:NADPH: A. 12:12 ?. 18:12 ?. 12:18 D. 18:18 E. 6:6 14. Fermentation A. uses an inorganic molecule as the final electron acceptor. B. starts with pyruvate and uses organic molecules as the final electron acceptors. C. results in the production of a large amount of ATP. D. produces different fermentation products which are typical of different types of organisms E. B&D; 15. Urine samples (one microliter volume) are commonly spread onto blood agar and MacConkey agar. A urine sample with more than 100,000 organisms/ml (100 colonies on the plate) is considered indicative of infection. If a urine sample containing 2,000 bacteria/ml with a generation time of 30 minutes, sits for 3 hours before finally being assayed, how many bacteria will then be present/ml? ?. 10,000 B. 64,000 C. 128,000 D. 256,000 E. none of the above 16. Glycolysis A. requires oxygen. B. produces 3 ATP molecules. C. produces 4 molecules of NADH D. may occur under acrobic or anaerobic conditions. E. B and C 17. Which of the following places the steps of the Gram stain in the correct order? 1-Alcohol-acetone; 2-Crystal violet; 3-Safranin;4-lodine A. 1-2-3-4 B. 2-1-4-3 C. 2-4-1-3 D. 4-3-2-1 E 1-3-2-4Explanation / Answer
12.
Both A. and C. are true. If it is only one correct answer then i will go with A. Sanitizes, rather than sterilizes.
Reason: Antiseptics are used on open wounds, they do not kill all the microorganism, some non harmful microorganisms can remain.
13.
B. 18:12
14.
E. B and D
15.
C. 128,000
Calculation:
Total generations = 3 hrs/ 30 min = 180 min / 30 min = 6
So the initial population doubles 6 times hence it becomes 26 = 64 time the initial population
Hence, # of bacteria after 3 hrs = 2000*64 = 128,000
16.
D. May occur under aerobic or anaerobic conditions.
17.
C. 2 - 4 - 1 - 3
Procedure -
Primary staining (crystal violet) -> Adding iodine (binds crystal violet and traps it) -> Decolorization (Ethanol/acetone) -> Counterstaining (Safranin)
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