Table of contents

1. Matter and Measurements4h 31m
2. Atoms and the Periodic Table5h 23m
3. Ionic Compounds2h 18m
4. Molecular Compounds2h 18m
5. Classification & Balancing of Chemical Reactions3h 17m
6. Chemical Reactions & Quantities2h 27m
7. Energy, Rate and Equilibrium3h 46m
8. Gases, Liquids and Solids3h 25m
9. Solutions4h 10m
10. Acids and Bases3h 29m
11. Nuclear Chemistry56m
BONUS: Lab Techniques and Procedures1h 38m
BONUS: Mathematical Operations and Functions47m
12. Introduction to Organic Chemistry1h 34m
13. Alkenes, Alkynes, and Aromatic Compounds2h 12m
14. Compounds with Oxygen or Sulfur1h 6m
15. Aldehydes and Ketones1h 1m
16. Carboxylic Acids and Their Derivatives1h 11m
17. Amines39m
18. Amino Acids and Proteins1h 51m
19. Enzymes1h 37m
20. Carbohydrates1h 41m
21. The Generation of Biochemical Energy2h 8m
22. Carbohydrate Metabolism2h 22m
23. Lipids2h 26m
24. Lipid Metabolism1h 45m
25. Protein and Amino Acid Metabolism1h 37m
26. Nucleic Acids and Protein Synthesis2h 54m

23. Lipids

Membrane Transport

GOB Chemistry

23. Lipids

Membrane Transport

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5:12 minutes

Problem 53b

Textbook Question

Identify the type of transport (passive diffusion, facilitated transport, or active transport) that will occur for the following molecules:
(b) glucose, no energy required

Verified step by step guidance

Understand the three types of transport mechanisms: Passive diffusion involves movement of molecules from high to low concentration without energy or assistance. Facilitated transport also moves molecules from high to low concentration but requires a protein channel or carrier. Active transport moves molecules against the concentration gradient (low to high) and requires energy (ATP).

Analyze the molecule in question, glucose. Glucose is a polar molecule and relatively large, which means it cannot pass directly through the hydrophobic lipid bilayer of the cell membrane by passive diffusion.

Determine if energy is required for the transport. The problem specifies 'no energy required,' which rules out active transport.

Consider facilitated transport. Glucose often uses protein carriers or channels to move across the membrane without requiring energy, making facilitated transport the likely mechanism.

Conclude that the transport mechanism for glucose, given that no energy is required, is facilitated transport, as it relies on protein channels or carriers to move across the membrane.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Passive Diffusion

Passive diffusion is the movement of molecules across a cell membrane without the need for energy input. This process occurs when molecules move from an area of higher concentration to an area of lower concentration, following their concentration gradient. Small, nonpolar molecules, such as oxygen and carbon dioxide, typically utilize this method to enter or exit cells.

Facilitated Transport

Facilitated transport, also known as facilitated diffusion, is a type of passive transport that requires specific transport proteins to help move molecules across the cell membrane. This process is essential for larger or polar molecules, like glucose, which cannot easily pass through the lipid bilayer. Facilitated transport does not require energy, as it still relies on the concentration gradient.

Active Transport

Active transport is the movement of molecules across a cell membrane against their concentration gradient, which requires energy, usually in the form of ATP. This process is crucial for maintaining cellular concentrations of ions and nutrients, allowing cells to uptake substances even when they are in lower concentrations outside. Examples include the sodium-potassium pump and proton pumps.

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