Amino Acids & Proteins

Which amino acid is chemiluminescent?

• Glycine

• Tryptophan

• Cysteine

• Valine

Which amino acid contains an SH group?

• Serine

• Cysteine

• Methionine

• Lysine

Phenylketonuria (PKU) affects which amino acid?

• Alanine

• Glycine

• Phenylalanine

• Tyrosine

The primary structure of a protein is

• Quaternary structure

• Amino acid sequence

• Alpha-helix

• b) Beta-sheet

5. In sickle cell disease, which amino acid is replaced?

• a) Valine to Glutamate

• b) Glutamate to Valine

• c) Lysine to Arginine

• d) Histidine to Proline

Which of the following (myoglobin, hemoglobin) has a tertiary or quaternary structure?

• Hemoglobin has a quaternary structure.
• Myoglobin has a tertiary structure.
• Hemoglobin has only a tertiary structure.
• Myoglobin has a quaternary structure.

Hemoglobin is an example of:

• Secondary protein

• Quaternary protein

• Tertiary protein

• Primary protein

What happens when a protein is denatured?

• The protein gains a new functional structure.
• The protein retains its original structure and function.
• The protein becomes more stable and active.
• The protein loses its functional structure and activity.

Which of the following can cause protein denaturation?

• Exposure to light
• Normal body temperature
• Low humidity levels
• Extreme temperatures, pH changes, and exposure to chemicals.

A homodimer protein consists of

• A single subunit
• Two identical subunits
• Three identical subunits
• Two different subunits