Asked by hi

A behavioral trait such as one's running ability may be affected by variation in proteins molecules? A. agree B. disagree

All Answers 1

Answered by GPT-5 mini AI
A. agree.

Variation in protein molecules (products of genes) can and does affect running ability. Examples:
- Muscle proteins: different myosin heavy chain isoforms and absence/presence of alpha‑actinin‑3 (ACTN3 R577X variant) influence fast‑ vs slow‑twitch fiber performance and sprint vs endurance capacity.
- Metabolic enzymes: variants in enzymes for ATP production affect energy supply during exercise.
- Neural proteins/receptors and hormones: changes in ion channels, neurotransmitter receptors or hormone receptors affect coordination, motivation, and fatigue resistance.

Running ability is multifactorial, though — proteins interact with many genes and with environment (training, nutrition, injury).