16-What is the chemical composition of slime layer or capsule A. Polypeptides B.
ID: 132911 • Letter: 1
Question
16-What is the chemical composition of slime layer or capsule A. Polypeptides B. Polysaccharides C. Fats D. Nucleic acids 17- Which of the following is FALSE about bacteria? A. they lack a defined nucleus surrounded by nuclear membrane B they lack cellular organelles such as mitochondria and chloroplast C. their ribosomes are structurally different than higher cells D. they divide by mitosis E. all the sentences above are true 18-To destroy endospores by heating, they must be exposed for 15-20 minutes to steam under 15 PSI (pounds per square inch) of pressure, which generates a final temperature of 121'C, Such conditions are produced by a. a speed vacuum b, a microwave c. an oven d. an autoclave 19-In negative staining what external bacterial structure can be demonstrated A. Capsule B. Nucleoid C. Flagella D. None of these 20-In sporulation the water content of the endospore is A. Reduce by 1-5% B. Increase by 1.5% C. Increase by 10-30% D. Reduce by 10-30% 21-A microscope has a 10x ocular lens and a 10x objective, what is this microscope's total magnification? A. 10x B. 100x C. Ix D. 1000x in certain bacterial cells. 22-Acid- fast is a technique used to detect presence of in A. Lipids B. Citric acid C. Mycolic acid D. Cholera 23-What is the counter stain in acid-fast stain? A. Basic fuchsin B. Acid-alcohol C. Methylene blue D. India inkExplanation / Answer
16. Option B is correct.
slime layer and capsule are composed of carbohydrates.
17. Option D is correct.
Bacteria divide by binary fission (Some people do not consider binary fission as mitosis. If you consider both as same, then all the given options are true)
18. Option D is correct.
Autoclving conditions = 121'C, 15 lb pressure for 15 min
19. Option A is correct.
In negative staining, the presence of the capsule can be demonstrated.
20. Option D is correct.
During sporulation, the water content is reduced to 10-30% of the vegetative cell.
21. Option D is correct.
The microscope's total magnification = 10 X 10 = 100X
22. Option C is correct.
Carbolfuschin stains mycolic acid.
23. Option C is correct.
Methylene blue can be used as a counterstain in the acid-fast stain.
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