11. The cell wall of

A. gram-positive bacteria are thicker than gram-negative bacteria
B. gram-negative bacteria are thicker than gram-positive bacteria
C. both have same thickness but composition is different
D. none of these

12. Peptidoglycan is also known as

A. N-acetyl muramic acid
B. murein mucopeptide
C. N acetylglucosamine
D. meso diaminopimelic acid

13. Genetic system is located in the prokaryotes in

A. nucleoid
B. chromatin
C. nuclear material
D. all of these

14. Which is most likely to be exposed on the surface of a gram-negative bacterium?

A. Pore protein (porin)
B. Protein involved in energy generation
C. Lipoteichoic acid
D. Phospholipids

15. The last step in the synthesis of peptidoglycan is

A. attachment of a peptide to muramic acid
B. attaching two amino acids to form a cross-link
C. attachment of a portion of peptidoglycan to a membrane lipid
D. binding of penicillin to a membrane protein