Question

multiple choice question
lipid a of lps is composed of ______.

○ glycine crossbridge
○ two glucosamine sugar derivatives
○ repeats of nag and nam
○ two alanine amino acid derivatives

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Explanation:

Lipid A, a part of lipopolysaccharide (LPS), is known to be composed of two glucosamine sugar derivatives (usually phosphorylated) with fatty acid chains attached. A glycine crossbridge is related to peptidoglycan in bacteria, repeats of NAG and NAM are the glycan chain of peptidoglycan, and alanine derivatives are not part of Lipid A's structure. So the correct option is "two glucosamine sugar derivatives".

Answer:

B. two glucosamine sugar derivatives (assuming the second option is labeled B; if the original numbering is different, adjust the label but the text remains "two glucosamine sugar derivatives")