Podcast
Questions and Answers
Which of the following is NOT a primary function of the cell membrane?
Which of the following is NOT a primary function of the cell membrane?
- Regulating the entry and exit of substances.
- Generating energy through ATP synthesis. (correct)
- Acting as a barrier between the cell's internal and external environment.
- Providing structural support to the cell.
The fluid mosaic model suggests that the cell membrane is a rigid and static structure.
The fluid mosaic model suggests that the cell membrane is a rigid and static structure.
False (B)
What property of the phospholipid bilayer allows lipid-soluble substances to easily dissolve and pass through the cell membrane?
What property of the phospholipid bilayer allows lipid-soluble substances to easily dissolve and pass through the cell membrane?
hydrophobic tail
In facilitated diffusion, _______ proteins bind to specific molecules, changing shape to transport them across the cell membrane.
In facilitated diffusion, _______ proteins bind to specific molecules, changing shape to transport them across the cell membrane.
Which type of cell transport requires energy to move substances against their concentration gradient?
Which type of cell transport requires energy to move substances against their concentration gradient?
During the process of exocytosis, what happens to the vesicle?
During the process of exocytosis, what happens to the vesicle?
Match each protein type found in the cell membrane with its primary function:
Match each protein type found in the cell membrane with its primary function:
A cell needs to import a large molecule that is too big to pass through channel proteins. Which transport mechanism would it most likely use?
A cell needs to import a large molecule that is too big to pass through channel proteins. Which transport mechanism would it most likely use?
Flashcards
Cell Membrane Function
Cell Membrane Function
Acts as a barrier, regulates substance entry/exit, senses changes, and supports the cell.
Fluid Mosaic Model
Fluid Mosaic Model
Cell membrane model with structures moving to form a semi-permeable barrier.
Cell Membrane Structure
Cell Membrane Structure
Double layer of lipids with a hydrophilic head and hydrophobic tail, plus embedded cholesterol.
Simple Diffusion
Simple Diffusion
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Facilitated Diffusion
Facilitated Diffusion
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Active Transport
Active Transport
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Vesicular Transport
Vesicular Transport
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Endocytosis
Endocytosis
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Study Notes
- Cell membrane functions include acting as a barrier, regulating substance entry and exit, responding to changes, and providing cell support
- Cell membranes facilitate constant material exchange between fluids to maintain homeostasis
- The fluid mosaic model describes the cell membrane as composed of numerous structures that flow and move, creating a semi-permeable barrier
Cell Membrane Components
- Fluid refers to the ability of the components to flow and move as needed
- Mosaic indicates the membrane comprises many structures
- Semi-permeable means that the membrane allows some substances to pass through while restricting others
Cell Membrane Structure
- Consists of a double layer of lipids (fat) with a phosphate group
- The phospholipid bilayer is formed by hydrophobic tails (water-fearing) and hydrophilic heads (water-loving)
- Cholesterol is embedded within the membrane
- The structure of the cell membrane regulates its semi-permeability
- Lipids make up the membrane; lipid-soluble substances can dissolve and pass through
- Cholesterol and proteins ensure the cell membrane as a whole provides function, integrity, and stability
- Proteins in the cell membrane include carrier proteins, channel proteins, receptor proteins, and cell identity markers
Cell Transport Mechanisms
- Simple diffusion involves particles spreading from an area of high concentration to low concentration
- Fat-soluble substances and micromolecules can pass through the membrane via simple diffusion
- Simple diffusion doesn't require energy, making it a passive process
- Facilitated diffusion needs transport proteins
- Channel proteins are size-specific, while carrier proteins are chemical specific through receptor sites
- Facilitated diffusion, like simple diffusion, doesn't need energy, following a passive process with a concentration gradient from high to low concentration
- Active transport requires energy to move substances against the concentration gradient, from low to high concentration
- Vesicular transport is an active transport method that requires energy and includes endocytosis and exocytosis
- During vesicular transport, the vesicle structure matches the cell membrane structure
- Endocytosis is the process of "cell eating," where the membrane folds to form a vesicle, which then pinches off from the membrane and floats into the cytoplasm
- Exocytosis, or "cell vomiting," involves a vesicle fusing with the membrane and pushing its contents out into the extracellular fluid
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Description
Explore cell membrane functions: acting as a barrier, regulating substance exchange, responding to changes, and providing cell support. The fluid mosaic model highlights its dynamic, semi-permeable nature. Consisting of a phospholipid bilayer with hydrophobic tails and hydrophilic heads, embedded cholesterol contributes to its structure and semi-permeability.
