Period: 6. You do a gram stain on the same bacteria above and notice its purple,

Question

Period: 6. You do a gram stain on the same bacteria above and notice its purple, this means: a. The bacteria has a thick peptidoglycan layer b. The bacteria has no peptidoglycan layer c. The bacteria has a medium peptidoglycan layer d. Gram stains test viruses, not bacteria hat st ructure A bacterial cell senses a lack of water, food and growing amounts of poison. W should it make to survive? 7. a. Meiosis b. Endospore C. DNA d. Gram Stain 8. Bacteria are called chemical recyclers. Without them recycling the world would probably: a. b. c. d. Be fine, we have other organisms to recycle chemicals. Be overrun with dead organic material Have no basic materials to make new organisms B and C

Explanation / Answer

6. a) a gram-positive bacteria shows a purple colour because of Crystal violet gets retained in the thick peptidoglycan layer of the bacteria.

7. b) Endospore formation is survival mechanism of bacteria.

8.d) Bacteria are decomposers of dead organic matters and they can also produce oxygen. Some may contribute to essential nutrient cycle.Some are nitrogen fixers.In short, we need them for our survival.

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