30. Which of the following techniques uses the Svedberg unit (S)? (A) electron m

Question

30.Which of the following techniques uses the Svedberg unit (S)?

(A)  electron microscopy                                          (B)  ultracentrifugation

(C)  X-ray crystallography                                        (D)  genetic analysis

(E)  sonication

31.Which of the following is NOT a function performed by the cell membrane or its components?

(A)  production of proteins                                       (B)  detection of environmental signals

(C)  transport of molecules into and out of the cell     (D)  separation of charge across the membrane

(E)  B and D

32.Which of the following statement is true?

(A)  Lipopolysaccharides (LPS) are found in the cell wall of Gram-negative bacteria.

(B)  Lipopolysaccharides (LPS) are found in the cell wall of Gram-positive bacteria.

(C)  Teichoic acids are found in the cell wall of Gram-negative bacteria.

(D)  Teichoic acids are found in the cell wall of Gram-positive bacteria.

(E)  Cholesterol is found in the cell wall of Gram-negative bacteria.

33.Which of the following is found in Archaeabut not in Bacteria?

(A)  Hopanoids                                                       (B)  Terpenoids

(C)  Cholesterol                                                       (D)  S-layer

(E)  Peptidoglycan

34.The glycan chain of archaeal cell wall is made of __________ and __________, while the glycan chain of bacterial cell wall is made of __________ and __________.

(A)  peptidoglycan and murein, pseudopeptidoglycan and murein

(B)  N-acetylglucosamine and N-acetyltalosaminuronic acid,

      N-acetylmuramic acid and N-acetyltalosaminuronic acid

(C)  N-acetylglucosamine and N-acetyltalosaminuronic acid,

      N-acetylglucosamine and N-acetylmuramic acid

(D)  N-acetylglucosamine and N-acetylmuramic acid,

      N-acetylglucosamine and N-acetyltalosaminuronic acid

(E)  N-acetylmuramic acid and N-acetyltalosaminuronic acid,

      N-acetylglucosamine and N-acetyltalosaminuronic acid

35.The sacculus of bacteria is composed primarily of

(A)  phospholipids                                                   (B)  peptidoglycans

(C)  carbohydrates                                                  (D)  amino acids

(E)  nucleic acids

36.Lysozyme attacks the following linkage in the bacterial cell wall:

(A)  (1,4)-glycosidic bonds

(B)  (1,3)-glycosidic bonds

(C)  Glycine peptide interbridges

(D)  Peptide cross-links between glycan chains

(E)  Peptide bonds between L-alanine and D-glutamic acid

Explanation / Answer

30. (B) ultracentrifuge

31. (A) production of proteins

32. (A) cell wall of gram (-) has LPS

33. (D) S - layer

34. (C) N-acetylglucosamine and N-acetyltalosaminuronic acid,

      N-acetylglucosamine and N-acetylmuramic acid

35. (B) peptidoglycans

36. (A) beta(1,4)-glycosidic bonds

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