Question

which protein is correctly matched with its cell type and function?
hemoglobin – skin cells – protects against infection
keratin – red blood cells – carries oxygen
actin and myosin – muscle cells – allow contraction
axons – muscle cells – send electrical signals

Explanation:

• Analyze each option:
• Hemoglobin is in red blood cells (not skin cells) and carries oxygen (not protects against infection).
• Keratin is in skin cells (not red blood cells) and provides structural support (not carries oxygen).
• Actin and myosin are proteins in muscle cells that interact to allow muscle contraction, which is correct.
• Axons are part of neurons (not muscle cells) and send electrical signals.

Answer:

C. Actin and myosin – muscle cells – allow contraction