11, (2 points) McConkey agar is both a selective and differential medium which o

Question

11, (2 points) McConkey agar is both a selective and differential medium which of the following answers is correct about the selective and differential properties of McConkey agar A. The bile salts select against Gram-positive organisms. B. The bile salts select against Gram-negative organisms C. The lactose sugar differentiates those bacteria that use and do not use this sugar as a carbohydrate source. D. Both B and C are correct E. Both A and C are correct 12. (2 points) Which of the following is false about Schizogony. A. It consists of multiple fission. B. Schizogony results in multiple daughter cells. C. The nucleus will divide into multiple nuclei during the cell division. D. The cytoplasm will concentrate around the nuclei. 13. (2 points) Which function(s) are directly driven by the proton motive force. A. The formation of fermentation by-products B. Flagellar assembly C. Uptake of nutrients D. All of the above 14. (2 points) What is the main objective of staining bacteria? A. Allow observation of bacterial organelles B. To create contrast between the bacteria and the background C. Both A and B 15. (2 points) Symport active transport involves A. a protein channel assisting with substrate movement across the membrane down the concentration gradient. B. the use of protein channel where the movement of a substrate down its concentration gradient provides energy for a different substrate to move against its concentration gradient. C. chemically modifying a substrate to create a down gradient. D. using a single protein to transport one substrate out of the cell and another substrate into the cell, both against their concentration gradients. Fill in the Blank Questions 16. (2 points) In with very high resolution, while in moves across the surface of the specimen and is reflected electron beams penetrate a thin section of tissue the electron beams

Explanation / Answer

Please note as per Chegg’s policy, I’ll only answer first four questions.

11. MacConkey agar is a selective and differential culture medium designed to selectively isolate gram-negative bacteria and differentiate them based on lactose fermentation. Therefore, your answer is ( D ).

12. Schizogony refers to a form of asexual reproduction by multiple fission in which the nucleus first divides and then the cell divides into many daughter cells. The nucleus in schizogony divides into multiple nuclei during cell division, which is followed by segmentation of cytoplasm. Therefore, all the given options above schizogony are true except option ( D ) because during schizogony cytoplasm does not concentrate but it segments. Hence your answer is ( D ).

13. Flagellar movement in cells takes place by utilizing the energy from proton motive force (PMF). Uptake of several ions is also driven by PMF inside the cell. Formation of fermentation byproducts is not directly driven by PMF. Therefore, your answers are ( B ) and ( C ).

14. Staining of bacteria serves both the purposes that is creating a contrast between the bacteria and the background and allowing observation of bacterial organelles. Therefore, your answer is ( C )

15. Symport active transport involves the movement of one species down the concentration gradient and the use of energy from this transport to power the transport of another species against the concentration gradient in the same direction. Therefore, your answer is ( B ).

16. In Transmission Electron Microscopy, the electron bean penetrates a thin section of tissue with very high resoultion. In Scanning Electron Microscopy, the electron beam moves across the surface of the specimen and is reflected.

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