Biology Multiple Choice Questions and Answers for Different Competitive Exams

Multiple Choice Questions on Bacterial cell wall

Multiple Choice Questions on Bacterial cell wall
1. Penicillin interfere with bacterial cell wall synthesis by inhibiting
a) NAG-NAM linkage
b) DD-transpeptidases
c) NAM-amino acid linkage
d) All of the above
2. Bacterial cell wall is made up of  
a) chitin
b) cellulose
c) peptidoglycan
d) mannose
3. Teichoic acid is present in the cell wall of
a) Gram positive bacteria
b) Gram negative bacteria
c) Mycoplasma
d) All bacteria
4. Peptidoglycan is a polymer made up of  
a) N-acetylglucosamine (NAG)
b) N-acetylmuramic acid (NAM)
c) amino acids
d) all of the above
5. NAG and NAM of peptidoglycan cell wall is joined by
a) β-(1,4) glycosidic linkage
b) α-(1,4) glycosidic linkage
c) β-(1,4) and α-(1,4) glycosidic linkage
d) α-(1,6) glycosidic linkage
6. Amino acids of peptidoglycan is  
a) D type
b) L type
c) Both D and L type
d) glycine only
7. The outer membrane of gram negative bacteria is made up of
a) peptidoglycan
b) NAG and NAM only
c) lipopolysaccharides
d) lipopolysaccharides with porins
8. Lysozyme in tears exhibits antibacterial activity by
a) NAG-NAM β-(1,4) glycosidic linkage
b) DD-transpeptidases
c) NAM-amino acid linkage
d) None of the above
9.  Gram negative bacteria are more resistant to antibiotics because of the presence of
a) Thin peptidoglycan wall
b) Outer lipopolysaccharide layer
c) porin protein
d) teichoic acid
10. Which of the following antibiotic inhibit lipid phosphatase, preventing the release of the finished peptidoglycan from its lipid carrier?
a) penicillin
b) cycloserine
c) Tunicamycin
d) Bacitracin

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Answers
1. b) DD-transpeptidases
2. c) peptidoglycan
3. a) Gram positive bacteria
4. d) all of above
5. a) β-(1,4) glycosidic linkage
6. c) Both D and L type
7. d) lipopolysaccharides with porins
8. a) NAG-NAM β-(1,4) glycosidic linkage
9. b) Outer lipopolysaccharide layer
10. d) Bacitracin

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