Multiple Choice
What type of bond forms between two amino acids during protein synthesis?
29. Amino Acids
Proteins and Amino Acids
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Which of the following amino acids is a component of peptidoglycan?
A
L-leucine
B
L-tryptophan
C
L-phenylalanine
D
L-alanine
Verified step by step guidance1
Understand the structure of peptidoglycan: Peptidoglycan is a polymer that forms a mesh-like layer outside the plasma membrane of most bacteria, providing structural support. It consists of sugar chains cross-linked by short peptides.
Identify the amino acids commonly found in peptidoglycan: The peptide component of peptidoglycan typically includes amino acids such as L-alanine, D-glutamic acid, meso-diaminopimelic acid, and D-alanine.
Recognize the role of L-alanine: L-alanine is one of the amino acids that is frequently found in the peptide chains of peptidoglycan. It is involved in the cross-linking process that gives peptidoglycan its strength.
Compare the given amino acids: L-leucine, L-tryptophan, and L-phenylalanine are not typically found in peptidoglycan. These amino acids are more commonly associated with protein synthesis rather than peptidoglycan structure.
Conclude with the correct amino acid: Based on the typical composition of peptidoglycan, L-alanine is the amino acid that is a component of peptidoglycan, as it is involved in the cross-linking of the peptide chains.
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