Cell Membrane Interactions

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What is the function of CCR5 in HIV infection?

It is not essential for HIV infection

It is a type of protein

It prevents HIV from infecting the cell

It helps HIV infect the cell (correct)

What do membrane carbohydrates recognize on the surface of other cells?

Molecules containing carbohydrates (correct)

Lipids only

Nucleic acids

Proteins only

What determines the asymmetrical distribution of proteins, lipids, and carbohydrates in the plasma membrane?

The lysosomes

The ER and Golgi apparatus (correct)

The extracellular matrix

The cytoskeleton

What is attached to lipids in glycolipids?

Carbohydrates Signup and view all the answers

Where are membrane carbohydrates most commonly attached?

To proteins Signup and view all the answers

What is the term for proteins with attached carbohydrates?

Glycoproteins Signup and view all the answers

What is the main characteristic of passive transport across a membrane?

It is the diffusion of a substance without energy investment Signup and view all the answers

What is the tendency of molecules in diffusion?

To spread out evenly into the available space Signup and view all the answers

What is the direction of diffusion of substances in a population?

Directional, although individual molecules move randomly Signup and view all the answers

What is the state at which the rate of diffusion is equal in both directions?

Dynamic equilibrium Signup and view all the answers

What is the direction of net diffusion of a substance?

Towards the region of lower concentration Signup and view all the answers

Why is the diffusion of a substance across a biological membrane considered passive transport?

Because no energy is expended by the cell to move substances Signup and view all the answers

What is the result of membrane proteins mixing after 1 hour in a hybrid cell?

Mixed proteins are present Signup and view all the answers

What happens to membranes as temperatures cool?

They switch from a fluid state to a solid state Signup and view all the answers

What is the primary function of the sodium-potassium pump?

To pump Na+ out of the cell and K+ into the cell Signup and view all the answers

Why are membranes rich in unsaturated fatty acids more fluid?

Because they prevent tight packing Signup and view all the answers

What is the function of cholesterol in animal cell membranes at warm temperatures?

To restrain movement of phospholipids Signup and view all the answers

What happens to the shape of the sodium-potassium pump protein after Na+ binding and phosphorylation?

The protein's shape changes to decrease its affinity for Na+ Signup and view all the answers

What is released outside the cell after phosphorylation of the sodium-potassium pump protein?

Na+ Signup and view all the answers

What is the role of cholesterol in animal cell membranes at cool temperatures?

To maintain fluidity by preventing tight packing Signup and view all the answers

What do plants use to buffer membrane fluidity?

Related steroid lipids Signup and view all the answers

What is gained by the sodium-potassium pump protein after releasing the phosphate group?

A higher affinity for Na+ Signup and view all the answers

What is the energy source used by the sodium-potassium pump?

ATP Signup and view all the answers

What is the term for the process by which the sodium-potassium pump moves ions across the cell membrane?

Active transport Signup and view all the answers

What is the process by which a cell takes in macromolecules?

Endocytosis Signup and view all the answers

What is the type of endocytosis where a cell engulfs a particle in a vacuole?

Phagocytosis Signup and view all the answers

Cell Membrane Interactions

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