Answer: Keratin.
- A Collagen
- B Elastin
- C Keratin
- D Actin
Correct answer: C. Keratin
Explanation: Keratin is a fibrous structural protein found in hair, nails, and skin. It is rich in the amino acid cysteine which forms disulfide bonds.
As substrate concentration rises, reaction rate increases steeply at first, then plateaus at Vmax once every enzyme molecule is working at full capacity; Km is the substrate concentration giving half-maximal rate, and a LOWER Km means the enzyme reaches that rate with less substrate (higher affinity).
Concept context
Carbohydrates, proteins, lipids, nucleic acids, and enzyme kinetics. Essential foundation for understanding metabolism.