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Peptidoglycan Synthesis

View the animation below, then complete the quiz to test your knowledge of the concept.

1Which of the following statements about bactoprenol is FALSE?
A)it is a protein carrier
B)its active form is bactoprenol-phosphate
C)it binds UDP-N-acetyl muramic acid first and then UDP-N-acetyl glucosamine
D)it is recycled by a pyrophosphatase
E)choose this answer if all of the above are TRUE

2Which of the following statements best describes the FINAL structure of the peptide chain in peptidoglycan?
A)tetrapeptide linked to N-acetyl glucosamine
B)tetrapeptide linked to N-acetyl muramic acid
C)pentapeptide linked to N-acetyl glucosamine
D)pentapeptide linked to N-acetyl muramic acid
E)pentapeptide linked to both N-acetyl glucosamine and N-acetyl muramic acid

3In Escherichia coli, the crosslinking of peptidoglycan layers occurs between the amino acids
A)D-alanine and D-alanine.
B)D-alanine and L-alanine.
C)D-alanine and meso-diaminopimelic acid.
D)L-alanine and meso-diaminopimelic acid.
E)L-alanine and D-glutamic acid.

4Peptidoglycan is a structure that is only found in bacteria.

5During peptidoglycan formation amino acids are added without the help of transfer RNA and ribosomes.

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