Q9Biology
Question
2 marks
Write the function of protein.
Answer
Proteins perform diverse essential functions in living organisms, including catalysis, structural support, transport, signaling, defense, and regulation of gene expression.
- Enzymatic: proteins act as biological catalysts accelerating metabolic reactions (e.g., amylase, DNA polymerase).
- Structural: provide mechanical support (collagen in connective tissue, keratin in hair and nails).
- Transport: carry molecules in blood (hemoglobin transports O2; serum albumin transports fatty acids).
- Regulatory: hormones like insulin and growth hormone regulate physiological processes.
- Defensive: antibodies (immunoglobulins) recognize and neutralize pathogens.
- Receptor: membrane receptors receive and transduce signals from hormones and neurotransmitters.
- Motor: actin and myosin enable muscle contraction and cell movement.