Hydrogen bonds determine key properties in cellulose, hemoglobin, and water

Steps:

• Hydrogen bonds form between electronegative atoms like oxygen and hydrogen in polar molecules.
• Cellulose, a polysaccharide, relies on hydrogen bonds between glucose chains for its rigid, fibrous structure.
• Hemoglobin, a protein, uses hydrogen bonds in its secondary and tertiary structures to maintain shape and oxygen-binding function.
• Water molecules form extensive hydrogen bonds, leading to properties like high boiling point and cohesion.

Why A is correct:

• All three substances exhibit properties directly resulting from hydrogen bonding, as defined by intermolecular forces between -OH groups or similar polar sites.

Why the others are wrong:

• B excludes water, ignoring its hydrogen bond-dependent anomalies like surface tension.
• C excludes hemoglobin, overlooking hydrogen bonds essential for protein folding.
• D excludes cellulose, disregarding hydrogen bonds that provide its tensile strength.

Final answer: A