Question

the s-layer that is found on certain bacterial cells is composed of ______.

lipid or glycolipid

protein or glycoprotein

peptidoglycan

lipopolysaccharide

Explanation:

The S - layer (surface layer) of certain bacterial cells is known to be composed of protein or glycoprotein. Lipid or glycolipid is not the component of the S - layer. Peptidoglycan is the main component of the bacterial cell wall in many bacteria, not the S - layer. Lipopolysaccharide is a component of the outer membrane of Gram - negative bacteria, not the S - layer.

Answer:

B. protein or glycoprotein (assuming the options are labeled as A. lipid or glycolipid, B. protein or glycoprotein, C. peptidoglycan, D. lipopolysaccharide)