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

1. Overview of Cell Biology

Overview of Tissue Structures

Cell Biology

1. Overview of Cell Biology

Overview of Tissue Structures

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Multiple Choice

Which of the following correctly matches a sarcomere band with its description?

H zone: region containing both thick and thin filaments

I band: region containing only thick filaments

Z line: region containing only thin filaments

A band: region containing both thick and thin filaments

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Verified step by step guidance

Understand the structure of a sarcomere: A sarcomere is the functional unit of a muscle fiber, composed of thick filaments (myosin) and thin filaments (actin). It is organized into distinct regions or bands based on the arrangement of these filaments.

Review the key regions of the sarcomere: The A band contains both thick and thin filaments, the I band contains only thin filaments, the H zone contains only thick filaments, and the Z line marks the boundary between adjacent sarcomeres and anchors the thin filaments.

Analyze the given options: The H zone is described as containing both thick and thin filaments, which is incorrect because it contains only thick filaments. The I band is described as containing only thick filaments, which is incorrect because it contains only thin filaments. The Z line is described as containing only thin filaments, which is incorrect because it is a structural boundary and not a region containing filaments.

Evaluate the correct answer: The A band is correctly described as the region containing both thick and thin filaments. This is consistent with the structural organization of the sarcomere.

Conclude that the correct match is: 'A band: region containing both thick and thin filaments,' as it accurately describes the composition of the A band in the sarcomere.