actin and myosin collagen and tubulin hemoglobin and myoglobin amylase and polymerase
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Which two protein molecules are essential for muscle contraction and relaxation?
Possibilities:
- actin and myosin
- collagen and tubulin
- hemoglobin and myoglobin
- amylase and polymerase

actin and myosin