Apentix/AP Biology/Unit 1: Chemistry of Life/Question

AP Biologyeasymcq1 pt

Formation of which bond releases a molecule of water?

A.The glycosidic linkage joining two monosaccharides into a disaccharide

B.The breakage of a peptide bond during protein digestion

C.The separation of the two DNA strands as temperature rises

D.The evaporation of water vapor from the surface of a leaf

Explanation

Core Concept

Connecting two sugars is a condensation reaction: one monosaccharide contributes a hydroxyl and the other contributes a hydrogen, and these leave together as water while an oxygen bridge locks the rings together. The same accounting applies when peptide bonds and ester bonds form. Cleavage reactions run the opposite way and consume water instead of producing it.

Correct Answer

AThe glycosidic linkage joining two monosaccharides into a disaccharide

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