Table of contents

1. Overview of Cell Biology2h 49m
2. Chemical Components of Cells1h 14m
3. Energy1h 33m
4. DNA, Chromosomes, and Genomes2h 31m
5. DNA to RNA to Protein2h 31m
6. Proteins1h 36m
7. Gene Expression1h 42m
8. Membrane Structure1h 4m
- The Lipid Bilayer
  38m
- Membrane Proteins
  25m
9. Transport Across Membranes1h 52m
10. Anerobic Respiration1h 5m
11. Aerobic Respiration1h 11m
12. Photosynthesis52m
13. Intracellular Protein Transport2h 18m
14. Cell Signaling1h 28m
15. Cytoskeleton and Cell Movement1h 39m
16. Cell Division3h 5m
17. Meiosis and Sexual Reproduction50m
18. Cell Junctions and Tissues48m
19. Stem Cells13m
- Stem Cells
  13m
20. Cancer44m
21. The Immune System1h 6m
22. Techniques in Cell Biology1h 41m

16. Cell Division

Overview of the Cell Cycle

Cell Biology

16. Cell Division

Overview of the Cell Cycle

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Multiple Choice

In which region of the sarcomere do actin (thin) and myosin (thick) filaments overlap?

H zone

I band

A band

Z line

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Verified step by step guidance

Understand the structure of the sarcomere: The sarcomere is the functional unit of a muscle fiber, composed of repeating units of actin (thin filaments) and myosin (thick filaments). It is organized into distinct regions: the A band, I band, H zone, and Z line.

Define the A band: The A band is the region of the sarcomere that contains the entire length of the myosin (thick) filaments. It also includes the area where actin (thin) filaments overlap with myosin filaments.

Define the H zone: The H zone is a central region within the A band where only myosin (thick) filaments are present, with no overlap of actin filaments.

Define the I band: The I band is the region of the sarcomere that contains only actin (thin) filaments and no myosin filaments. It is located on either side of the Z line.

Conclude that the A band is the correct answer: Since the A band includes the region where actin and myosin filaments overlap, it is the correct answer to the question.