erioiogy e cell walls of Gram-positive and Gram-negative bacteria are structurally different but both contain peptidoglycan. Which TWO of the following statements about peptidoglycan biosynthesis are CORRECT? O Peptidoglycans are made from alternating units of N-acetylmuramic acid and N-acetylglucosamine. O N-acetylglucosamine is synthesised from N-acetylmuramic acid by the addition of acetic acid derived from phosphoenolpyruvate. O Peptidoglycan synthesis in Gram-positive bacteria involves the addition of the amino acids, L-alanine, D-glutamic acid, L-lysine, to N-acetylmuramic acid. O D-glutamic acid-D-glutamic acid dipeptide is linked to the tripeptide side chain of N-acetylmuramic acid to form N-acetylmuramic acid-pentapeptide O At the beginning of the biosynthesis pathway, the N-acetylglucosamine-N-acetylmuramic acid-pentapeptide-phospholipid crosses the cell membrane and is added to growing peptidoglycan chain. O The transglycosylase enzyme is located on the inner face of the cytoplasmic membrane. O A small peptide carrier binds to NAG-NAMA-pentapeptide and takes it across the cell membrane during the final stages of peptidyoglycan synthesis.

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Nucleotides

It is an organic molecule made up of three basic components- a nitrogenous base, phosphate,and pentose sugar. The nucleotides are important for metabolic reactions andthe formation of DNA (deoxyribonucleic acid) and RNA (ribonucleic acid). 

Nucleic Acids

Nucleic acids are essential biomolecules present in prokaryotic and eukaryotic cells and viruses. They carry the genetic information for the synthesis of proteins and cellular replication. The nucleic acids are of two types: deoxyribonucleic acid (DNA) and ribonucleic acid (RNA). The structure of all proteins and ultimately every biomolecule and cellular component is a product of information encoded in the sequence of nucleic acids. Parts of a DNA molecule containing the information needed to synthesize a protein or an RNA are genes. Nucleic acids can store and transmit genetic information from one generation to the next, fundamental to any life form.