Recent Lessons

Show all results for ""

Feature Overview

Ace your exams with our all-in-one platform for creating and sharing quizzes and tests.

Quizzes

Create quizzes and tests automatically from your content using AI.

Flashcards

Automatically turn your notes into digital flashcards.

Share, Export & Embed

Share with classmates or export to Excel and your learning management system.

Stats & Reporting

Auto-grading quizzes and tests with detailed stats and reports.

Mobile Apps

The smarter way to study – wherever you are.

Pricing Schools Business

Features Pricing Schools Business

12 Questions

0 Views

Biology Membranes and Lipids

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 molecules are the constituents of biological membranes?

Carbohydrates, nucleic acids, and amino acids

Lipids, amino acids, and proteins

Lipids, proteins, and carbohydrates (correct)

Proteins, nucleic acids, and lipids

Why do lipids establish the physical integrity of the membrane?

To create a barrier for hydrophobic materials (correct)

To allow rapid passage of hydrophilic materials

To enhance the movement of carbohydrates within the membrane

To prevent the movement of proteins within the membrane

What model describes the general design of biological membranes?

Dynamic mesh model

Rigid barrier model

Solid crystal model

Fluid mosaic model (correct)

Which part of a phospholipid interacts with the aqueous environment?

Charged, hydrophilic heads (C) Signup and view all the answers

What is a characteristic of some membranes with regard to protein content?

Some membranes have more protein than lipids (B) Signup and view all the answers

Which molecule forms the hydrophobic core of the membrane?

Lipids (D) Signup and view all the answers

What is the thickness of a biological membrane, as mentioned in the text?

0.008 μm (B) Signup and view all the answers

In a biological membrane, what makes for a less dense and more fluid packing of the fatty acids in the lipid bilayer?

Unsaturated fatty acids with 'kinks' (D) Signup and view all the answers

Which component is important for membrane integrity and modulates membrane fluidity according to the text?

Cholesterol (A) Signup and view all the answers

What effect does having shorter-chain fatty acids, unsaturated fatty acids, or less cholesterol have on membrane fluidity?

Increases fluidity (A) Signup and view all the answers

Why is spontaneous phospholipid flip-flop from one half of the bilayer to the other rare?

Due to the movement of the polar part through the hydrophobic interior (D) Signup and view all the answers

How does temperature affect membrane fluidity?

Increases fluidity (B) Signup and view all the answers