Condensation Reaction in Biomolecule Formation

Steps:

• Identify condensation as a reaction where monomers link by losing water.
• Note that one condensation releases one H2O, linking exactly two monomers.
• Recognize disaccharides form from two monosaccharides this way.
• Contrast with polymers or complex lipids needing multiple reactions.

Why A is correct:

• A disaccharide forms by one condensation of two monosaccharides (e.g., glucose + fructose → sucrose + H₂O), matching the single water release.

Why the others are wrong:

• B: A phospholipid requires multiple condensations to assemble glycerol, fatty acids, and phosphate groups.
• C: A polysaccharide forms from many monosaccharides via numerous condensations, releasing multiple water molecules.
• D: A triglyceride forms from glycerol and three fatty acids through three esterification condensations, releasing three water molecules.

Final answer: A