U1_L7 WG

Multiple Choice

Which of the following best describes a polymer?

• A molecule made of repeating building blocks joined by covalent bonds

• A weak attraction between slightly charged parts of molecules

• A reaction that breaks molecules into smaller units

• A compound made of simple sugars

Open Ended

Gastroesophageal Reflux Disease is a condition where the pH of stomach acid can change rapidly. Use the text and model 2 to explain what would happen to the activity of lactase.

Multiple Select

Which of the following conditions can affect enzyme productivity?

• Temperature

• pH

• Light

• Pressure

Multiple Choice

Which functional groups are present in the general structure of an amino acid as shown in the diagram?

• Amino group and carboxyl group

• Hydroxyl group and methyl group

• Phosphate group and sulfhydryl group

• Aldehyde group and ketone group

Multiple Choice

What type of bond links amino acids together in a polypeptide chain?

• Peptide bond

• Hydrogen bond

• Ionic bond

• Disulfide bond

Multiple Choice

Which structural features distinguish an alpha helix from a beta-sheet in protein secondary structure?

• Alpha helix is a coiled structure, beta-sheet is a folded sheet-like structure

• Alpha helix has parallel strands, beta-sheet has antiparallel strands

• Alpha helix is stabilized by peptide bonds, beta-sheet is stabilized by disulfide bonds

• Alpha helix is found only in enzymes, beta-sheet is found only in antibodies