The Nucleus of a Cell Contains

question 10

Multiple Choice

The nucleus of a cell contains

• A)lysosomal enzymes
• B)the genetic components (i.e. ,genes)of the cell
• C)the enzymes that regulate glycolysis
• D)None of the above answers are correct

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Definitions:

Sarcoplasmic Reticulum

A network of membrane-enclosed tubules in muscle cells that stores and releases calcium ions, critical for muscle contraction.

Transverse Tubules

These are extensions of the cell membrane that penetrate into the center of skeletal and cardiac muscle cells, facilitating the uniform contraction of the muscle.

Sarcolemma

The thin, plasma membrane that envelopes a muscle cell (fiber), playing a critical role in muscle contraction.

Z Lines

Positions within muscle fibers that mark the boundaries of sarcomeres, playing a critical role in muscle contraction by anchoring actin filaments.