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

8. Membrane Structure

Membrane Proteins

Cell Biology

8. Membrane Structure

Membrane Proteins

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Multiple Choice

In the context of membrane proteins involved in ion transport, which letter in the accompanying figure most likely represents a large efflux of K+ ions from the cell?

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Verified step by step guidance

Understand the context: The problem involves membrane proteins responsible for ion transport, specifically focusing on the efflux (movement out of the cell) of K+ ions. Efflux typically occurs through specific ion channels or transporters.

Review the figure: Examine the accompanying figure (not provided here) to identify the labeled components (A, B, C, D). Look for any visual or descriptive cues that indicate ion movement, such as arrows, gradients, or channel structures.

Recall the mechanism of K+ efflux: Potassium ions (K+) typically move out of the cell through potassium channels, driven by the electrochemical gradient. This process is passive and does not require energy input, as K+ moves from a region of high concentration inside the cell to a lower concentration outside.

Match the mechanism to the figure: Identify which labeled component (A, B, C, or D) corresponds to a structure or process that facilitates the passive efflux of K+ ions. Look for features like a potassium channel or a pathway that aligns with the direction of ion movement.

Verify the answer: Cross-check the identified component with the question's context and ensure it aligns with the description of K+ efflux. Confirm that the selected label (e.g., C) represents the correct mechanism for the large efflux of K+ ions.