Which feature about sarcomeres is true?
A) The sarcomere is the cell membrane of a muscle cell.
B) Sarcomere is the name for a single muscle cell.
C) Sarcomere is another name for the endoplasmic reticulum of a muscle cell.
D) A sarcomere represents a contractile unit in a muscle cell.
E) A sarcomere is a long molecule of either actin or myosin.
Correct Answer:
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