The cell walls of Bacteria contain

Question

BlackTom AI · Accepted Answer

The question asks about the composition of bacterial cell walls and provides four candidate substances to consider.
Option 1: Phospholipids. While phospholipids are major components of cellular membranes, they are not the primary structural material of the bacterial cell wall. Therefore this option does not correctly describe the cell wall.
Option 2: Cellulose. Cellulose is a polysaccharide found in plant cell walls and some algae, not in most bacterial cell walls. This makes this choice incorrect for bacteria.
Option 3: Peptidoglycan. This is the key structural polymer that gives most bacteria their rigid cell wall. It consists of sugar chains cross-linked by short peptides, providing shape and protection. This option accurately names the bacterial cell wall component.
Option 4: Starch. Starch is an energy storage polysaccharide in plants and some microorganisms, not a structural component of bacterial cell walls. Thus, this choice is not correct for bacteria.
In summary, Peptidoglycan correctly identifies the primary constituent of most bacterial cell walls, while the other options describe materials associated with membranes, plant walls, or energy storage rather than the bacterial wall itself.

AGRI10050_2025_SM1 Mega progress quiz Part 1 (W2-W4)

The cell walls of Bacteria contain

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