Cell Biology: Cell Membrane Functions
10 Questions
3 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to Lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the primary role of the cell membrane in relation to homeostasis?

  • It controls the movement of substances to maintain internal balance. (correct)
  • It synthesizes proteins necessary for cellular function.
  • It acts as a barrier preventing any interaction with the environment.
  • It allows all substances freely to enter and exit.

Which of the following is NOT a function of the cell membrane?

  • Providing support and protection for the cell.
  • Controlling what enters and exits the cell.
  • Facilitating cellular communication with other cells.
  • Regulating enzyme reactions within the cell. (correct)

What structural feature is characteristic of a cell membrane?

  • A single layer of cholesterol molecules.
  • A porous membrane allowing large molecules to pass through freely.
  • A rigid cell wall surrounding the membrane.
  • A phospholipid bilayer with embedded proteins. (correct)

In what way does the cell membrane contribute to the overall function of the cell?

<p>By controlling the passage of nutrients and waste products. (A)</p> Signup and view all the answers

Which best describes the composition of the cell membrane?

<p>Consists of a bilayer of phospholipids with various proteins. (C)</p> Signup and view all the answers

What is the main structural characteristic of the cell membrane?

<p>Double layer of phospholipids (D)</p> Signup and view all the answers

What property distinguishes the phosphate heads from the fatty acid tails in the phospholipid bilayer?

<p>Phosphate heads are polar, while fatty acid tails are non-polar (D)</p> Signup and view all the answers

What is the typical thickness range of the cell membrane?

<p>7.5-10 nanometers (B)</p> Signup and view all the answers

How do membrane proteins relate to the overall structure of the cell membrane?

<p>They are embedded within the membrane (A)</p> Signup and view all the answers

What is the role of the lipid bilayer's arrangement in the cell membrane?

<p>To separate the aqueous environments inside and outside the cell (D)</p> Signup and view all the answers

Flashcards

Cell Membrane Importance

The cell membrane controls what enters and exits the cell, maintaining a stable internal environment (homeostasis). It also protects and supports the cell.

Cell Membrane's Function

Regulates what enters and exits a cell; provides its structure.

Homeostasis Definition

Maintaining a stable internal environment within a cell.

Cell Membrane Structure

A complex structure with proteins embedded in a phospholipid bilayer.

Signup and view all the flashcards

Cell Membrane Function: Entry/Exit

Controls what enters or leaves the cell to maintain stability.

Signup and view all the flashcards

Cell membrane

A thin, flexible layer that surrounds all cells, controlling what enters and exits. It's made of a double layer of phospholipids (lipid bilayer) with proteins embedded in it.

Signup and view all the flashcards

Lipid bilayer

The core structure of the cell membrane. It's composed of two layers of phospholipids: the polar heads face outward, while the nonpolar tails face inward, forming a barrier.

Signup and view all the flashcards

Phospholipid head

The polar, water-loving part of a phospholipid. They face the watery environment both inside and outside the cell.

Signup and view all the flashcards

Fatty acid tails

The nonpolar, water-fearing part of a phospholipid. They form the center of the bilayer, avoiding the water.

Signup and view all the flashcards

Membrane proteins

Proteins embedded within the lipid bilayer. They serve various functions, like transporting molecules, receiving signals, and cell recognition.

Signup and view all the flashcards

Study Notes

Cell Membrane Structure and Function

  • All cells have a cell membrane
  • Functions:
    • Controls what enters and exits the cell to maintain internal balance called homeostasis
    • Provides protection and support for the cell
  • Importance of cell membrane:
    • It is a highly selective filter, permits nutrients and leaves the waste products from the cell.
    • Maintains homeostasis
    • Makes cytosol environment to different cells
    • Play an important role in cell to cell communication
    • Its detects Chemical messengers arriving at the cell surface.
  • Types of Transport mechanisms:
    • Passive Transport
      • Diffusion
      • Facilitated Diffusion
      • Osmosis
    • Active Transport
      • Protein Pumps
      • Vesicular/Bulk Transport

Studying That Suits You

Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

Quiz Team

Description

Test your knowledge on the functions and structure of the cell membrane. This quiz covers essential concepts related to homeostasis, composition, and the roles of membrane proteins. Understand how the cell membrane contributes to cellular function and maintains stability.

More Like This

Use Quizgecko on...
Browser
Open
Browser
Browser