A) peptidoglycan in the cell wall
B) the 80 S ribosome
C) nuclear membrane
D) mitochondria
Correct Answer: A
Solution :
Peptidoglycan or murein in the cell wall is specific only to prokaryotes. This rigid structure gives the cell shape and surrounds the cytoplasmic membrane. Peptidoglycan is a huge polymer of disaccharides (glycan) cross-linked by short chains of identical amino acids (peptides) monomers. The backbone of the peptidoglycan molecule is composed of two derivatives of glucose: N-acetylglucosamine (NAG) and N-acetylmuramic acid (NAM)
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