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Cell Biology: Plasma Membrane Structure and Function

10 Questions

4 Views

Cell Biology: Plasma Membrane Structure and Function

Created by

@PeaceableLarch

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Questions and Answers

What is the primary function of the plasma membrane?

To provide structure and support to the cell

To regulate the entrance and exit of molecules into and out of the cell (correct)

To produce energy for the cell

To synthesize proteins

What is the term for the maintenance of a steady internal environment within the cell?

Active transport

Osmosis

Passive transport

Homeostasis (correct)

What is the orientation of the hydrophilic polar heads in the phospholipid bilayer?

They face the interior of the cell

They face the exterior of the cell

They face each other, interior of the membrane

They face outside and inside of the cell (correct)

What is the role of steroids, such as cholesterol, in the plasma membrane?

To stiffen and strengthen the membrane Signup and view all the answers

What is the region of the phospholipid bilayer where the hydrophobic nonpolar tails are located?

The interior of the membrane, away from water Signup and view all the answers

What is the primary purpose of the phospholipid bilayer's hydrophilic polar heads?

To interact with water and facilitate transport Signup and view all the answers

What is the result of the phospholipid bilayer's hydrophobic nonpolar tails facing each other?

Stabilization of the membrane structure Signup and view all the answers

What is the function of the embedded proteins in the phospholipid bilayer?

To regulate the movement of molecules across the membrane Signup and view all the answers

What is the effect of cholesterol in animal cells on the plasma membrane?

Stiffening and strengthening of the membrane Signup and view all the answers

What is the environment that the plasma membrane separates the cell from?

The cell's external environment Signup and view all the answers

Study Notes

Plasma Membrane Overview

The plasma membrane acts as a barrier, segregating the cell's internal environment from the external surroundings.
It plays a crucial role in regulating the movement of molecules in and out of the cell.

Homeostasis

Homeostasis refers to the maintenance of a stable internal environment within the cell despite external changes.

Structure of the Plasma Membrane

Composed of a phospholipid bilayer, which features:
- Hydrophilic Polar Heads: Water-attracting regions that face both the inside and outside of the cell where water is present.
- Hydrophobic Nonpolar Tails: Water-repelling regions that face each other, forming the interior of the membrane and avoiding water.

Membrane Proteins

Embedded proteins are integral to the membrane's function, contributing to transport and signaling.

Role of Cholesterol

Cholesterol molecules are found within the plasma membrane of animal cells, providing stiffness and structural stability to the membrane.

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Description

Learn about the structure and function of the plasma membrane, including its role in regulating molecule transport and maintaining homeostasis. Understand the composition of the phospholipid bilayer and the properties of hydrophilic and hydrophobic regions.