35. The sacculus of bacteria is composed primarily of (A) phospholipids (B) pept

Question

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) B(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 37. The major function of the cell wall is (A) to facilitate cell divison (B) to serve as a diffusion barrier (C) to allow for bacterial motility (D) to provide rigid support and prevent lysis (E) to serve as an anchor for proteins 38. Penicillin and vancomycin prevent cross-bridge formation between (A) diaminopimelic acid and D-glutamic acid (B) L-alanine and D-alanine (C) diaminopimelic acid and D- alanine (D) diaminopimelic acid and L- alanine (E) D-glutamic acid and D-alanine 39.An outer membrane is found in (A) all cells (B) all prokaryotes (C) all bacteria (D all Gram-negative bacteria (E) all Gram-positive bacteria

Explanation / Answer

35 - The correct answer is option B that is peptidoglycan.

Succulus is made up of glycan strands cross linked by short peptides.

36 - The correct answer is option A that is beta 1-4 glycosidic bond.

Lysozyme breaks the bond of beta 1-4 glycosidic between NAM and NAG.

37 - The correct answer is option D that is to provide rigid support and prevent lysis.

Cross linking of different polymers make cell wall rigid structure tha gives support and shape and prevent diffusion that prevent lysis.

38 - The correct answer is option B that is L alanine and D alanine.

39 - The correct answer is option D that is all gram negative bacteria.

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