Bacteria Morphology – Section 1

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

Correct Answer: A. gram-positive bacteria are thicker than gram-negative bacteria

12. Peptidoglycan is also known as

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

Correct Answer: B. murein mucopeptide

13. Genetic system is located in the prokaryotes in

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

Correct Answer: 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

Correct Answer: A. Pore protein (porin)

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

Correct Answer: B. attaching two amino acids to form a cross-link

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