Plasma Membrane Structure and Function

Plasma Membrane Structure and Function

Assessment

Interactive Video

Biology, Science, Chemistry

9th - 10th Grade

Practice Problem

Hard

Created by

Patricia Brown

FREE Resource

The video explains the structure and function of the plasma membrane, focusing on the lipid bilayer. It describes how phospholipids form a bilayer with hydrophilic heads and hydrophobic tails, creating a selective barrier. The bilayer's structure allows selective permeability, enabling nonpolar molecules to diffuse freely while polar molecules require protein channels. This arrangement is crucial for maintaining cellular stability and regulating material exchange.

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10 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the primary function of the plasma membrane?

To produce proteins

To store genetic information

To protect the cell and regulate material entry and exit

To provide energy to the cell

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which molecules are primarily found in the plasma membrane?

Phospholipids

Proteins

Nucleic acids

Carbohydrates

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What characteristic makes phospholipids unique?

They have both hydrophilic and hydrophobic regions

They are entirely hydrophobic

They are nonpolar

They are entirely hydrophilic

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Why can't the plasma membrane consist of just one layer of phospholipids?

Because the hydrophilic heads would repel each other

Because the hydrophobic tails would have to interact with water

Because it would be too rigid

Because it would not allow any molecules to pass through

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How does the bilayer structure contribute to the stability of the plasma membrane?

By allowing only hydrophilic molecules to pass

By creating a hydrophobic region between two layers of heads

By forming a rigid structure

By being impermeable to all molecules

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How do polar molecules typically enter the cell?

Through direct diffusion across the bilayer

By dissolving in the hydrophobic core

By being repelled by the membrane

Using protein channels

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which type of molecules can freely move through the hydrophobic region of the membrane?

Polar molecules

Nonpolar molecules

Ions

Sugars

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