Table of contents

1. Introduction to Biochemistry4h 34m
2. Water3h 23m
3. Amino Acids8h 10m
4. Protein Structure10h 4m
5. Protein Techniques14h 5m
6. Enzymes and Enzyme Kinetics13h 38m
7. Enzyme Inhibition and Regulation 8h 42m
8. Protein Function 9h 41m
9. Carbohydrates7h 49m
10. Lipids5h 49m
11. Biological Membranes and Transport 6h 37m
12. Biosignaling9h 45m
Review 1: Nucleic Acids, Lipids, & Membranes2h 47m
Review 2: Biosignaling, Glycolysis, Gluconeogenesis, & PP-Pathway3h 12m
Review 3: Pyruvate & Fatty Acid Oxidation, Citric Acid Cycle, & Glycogen Metabolism2h 26m
Review 4: Amino Acid Oxidation, Oxidative Phosphorylation, & Photophosphorylation1h 48m

11. Biological Membranes and Transport

Membrane Transport of Ions

Biochemistry

11. Biological Membranes and Transport

Membrane Transport of Ions

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Multiple Choice

Facilitated diffusion of charged ions across a biological membrane is __________________:

Generally irreversible.

Endergonic.

Driven directly by ATP.

Not specific with respect to the type of ion.

Driven by a difference in the electrochemical gradient.

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Verified step by step guidance

Understand the concept of facilitated diffusion: Facilitated diffusion is a passive transport process where molecules move across a membrane with the help of a protein, without the expenditure of cellular energy (ATP).

Recognize the role of the electrochemical gradient: In facilitated diffusion, the movement of charged ions is driven by the electrochemical gradient, which is a combination of the concentration gradient and the electrical potential across the membrane.

Evaluate the options given: Analyze each option to determine if it aligns with the characteristics of facilitated diffusion. For example, facilitated diffusion is not directly driven by ATP, as it is a passive process.

Identify the correct characteristic: Facilitated diffusion is specific to the type of ion due to the specificity of the transport proteins, and it is reversible, as ions can move in both directions depending on the gradient.

Conclude with the correct answer: The movement of ions in facilitated diffusion is driven by a difference in the electrochemical gradient, which is the correct characteristic of this process.