Tuesday, September 16, 2025

actin and myosin

 

The bands in muscle sarcomere are formed by actin and which of the following other proteins?
MY ANSWER
Myosin contains "heads" that contact actin and pull the actin fibres together in an ATP-dependent mechanism that causes muscles to contract.
Dynein is an ATP-dependent molecule that "walks" along microtubules, causing them to move, but it is not part of the sarcomere.
Keratin is the fibrous protein of hair and nails and is not part of the sarcomere.
Laminin is a protein of the nuclear envelope and is not part of the sarcomere.

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