Question

43.Lipopolysaccharides (LPS) are found in: a. Gram-positive bacteria b. Gram-negative bacteria c. all Bacteria d. Archaea e. Eukaryotes

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44. There are similarities and differences between Gram-negative and Gram-positive bacteria. Which of the following is not true?

a. The cell wall of Gram-negative cells is composed of only one or two layers of peptidoglycan whereas the cell walls of Grampositive bacteria have many peptidoglycan layers

b. Only Gram-positive bacterial cells have a periplasm 2/6/18 8

c. The cell membranes of both Gram-negative and Gram-positive bacteria are lipid bilayers

d. There is a second membrane (called the outer membrane) just outside the cell wall of Gram-negative bacteria, but this is absent from Gram-positive bacteria

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45. The cell membranes of Bacteria

a. serve as a barrier that separates the cell contents from the environment

b. prevent cells from bursting due to osmotic pressure

c. can be stained to distinguished Gram positive from Gram negative bacteria

d. prevents the entry of organic compounds into cells.

e. all of the above

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46. Spontaneous generation is

a. the uncontrolled growth of microorganisms

b. the creation of families of organisms

c. the creation of living organisms from non-living material

d. explains why meat can spoil

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47. Pasteurization requires

a. vaccinating animals to protect them against Mycobacterium tuberculosis

b. the use of heat to kill most of the microorganisms found in liquids such as milk to preserve their taste

c. use of closed containers to prevent the spoilage of food

d. the use of heat to kill most of the microorganisms found in liquids to protect against infectious diseases such as tuberculosis

Answer 1

43.Lipopolysaccharides (LPS) are found in: b. Gram-negative bacteria

44. There are similarities and differences between Gram-negative and Gram-positive bacteria. Which of the following is not true? b. Only Gram-positive bacterial cells have a periplasm

45. The cell membranes of Bacteria: e. all of the above

46. Spontaneous generation is: c. the creation of living organisms from non-living material

47. Pasteurization requires: d. the use of heat to kill most of the microorganisms found in liquids to protect against infectious diseases such as tuberculosis