Question 1
Proteins occurring in the β-pleated sheet structure
◦ are relatively inelastic.
◦ never occur in nature.
◦ produce structurally weak materials.
◦ contain no peptide bonds.
◦ are not involved in hydrogen bonds.
Question 2
The backbone of a strand of nucleic acid consists of
◦ phosphate units only.
◦ phosphate and sugar units.
◦ polyester.
◦ phosphate, sugar, and nitrogen base units.
◦ sugar units only.