Cell Membrane Fluidity

Play an AI-generated podcast conversation about this lesson

Which of the following is a feature of all biological membranes?

Self-healing properties: Inability to repair damage and seal breaches

Permeability: Ability to flow freely without any restrictions

Rigidity: Inability to change shape without losing integrity or becoming leaky

Compartmentalization: Inability to separate different cellular components (correct)

What is the role of cholesterol in the cell membrane?

To prevent the formation of lipid bilayers

To decrease membrane fluidity

To act as a fluidity buffer (correct)

To increase membrane rigidity

What determines the structure and flexibility of the lipid bilayer?

Cellular pH

Protein composition

Temperature (correct)

DNA sequence

Which technique was used to visualize the phospholipids in the lipid bilayer?

Electron microscopy Signup and view all the answers

What is the function of vesicles in the cell membrane?

To transport lipids across the bilayer Signup and view all the answers

When did researchers first recognize the ability of lipid molecules to diffuse freely within lipid bilayers?

Around 1970 Signup and view all the answers

Which type of membrane is commonly used as model membranes in experimental studies?

Liposomes Signup and view all the answers

What is the process called when a lipid bilayer changes from a liquid state to a two-dimensional rigid crystalline state?

Phase transition Signup and view all the answers

Which of the following is NOT a factor that affects the fluidity of a lipid bilayer?

Temperature Signup and view all the answers

What is the term for the movement of phospholipids within the lipid bilayer?

Lateral diffusion Signup and view all the answers

What is the process called when lipids flip from one side of the lipid bilayer to the other?

Flip-flop Signup and view all the answers

What type of microscopy technique is used to demonstrate lateral diffusion in membranes?

Fluorescence microscopy Signup and view all the answers

Which of the following is a common function of the extracellular matrix (ECM)?

Cell adhesion Signup and view all the answers

What is the role of fibroblasts in the ECM?

Producing and secreting ECM Signup and view all the answers

Which type of connective tissue consists of collagen fibers and bone mineral?

Bone tissue Signup and view all the answers

What is the main function of glycosaminoglycans (GAGs) in the ECM?

Structural support Signup and view all the answers

Which class of macromolecules in the ECM is rich in proline and glycine amino acids?

Fibrous proteins like collagen Signup and view all the answers

What are collagen fibrils?

Long, stiff, triple-stranded helical proteins Signup and view all the answers

Which protein is responsible for giving tissues their elasticity, such as skin, blood vessels, and lungs?

Elastin Signup and view all the answers

What type of bonds join the molecules of elastin together to generate a cross-linked network?

Covalent bonds Signup and view all the answers

Which protein plays an important role in tissue repair, regulating cell attachment and motility, and embryogenesis?

Fibronectin Signup and view all the answers

What is the primary organizer of the sheet structure of the basal lamina?

Laminin Signup and view all the answers

Which family of transmembrane proteins facilitate cell adhesion and mediate cellular signals?

Integrins Signup and view all the answers

Which type of bonds hold the three long polypeptide chains of laminin together?

Disulfide bonds Signup and view all the answers

Which state is the lipid bilayer in at low temperatures?

Paracrystalline state Signup and view all the answers

What effect do unsaturated fatty acids have on the melting point of the lipid bilayer?

Decrease the melting point Signup and view all the answers

What effect does cholesterol have on the fluidity of the membrane at high temperatures?

Decreases fluidity Signup and view all the answers

What is the role of cis-double bonds in membrane phospholipids?

Decrease the tendency of hydrocarbon tails to interact Signup and view all the answers

What is the function of cholesterol in the lipid bilayer?

Increase permeability-barrier properties Signup and view all the answers

What effect does a shorter hydrocarbon chain have on the fluidity of the membrane at lower temperatures?

Increases fluidity Signup and view all the answers

Cell Membrane Fluidity

Podcast Beta

Questions and Answers

Which of the following is a feature of all biological membranes?

What is the role of cholesterol in the cell membrane?

What determines the structure and flexibility of the lipid bilayer?

Which technique was used to visualize the phospholipids in the lipid bilayer?

What is the function of vesicles in the cell membrane?

When did researchers first recognize the ability of lipid molecules to diffuse freely within lipid bilayers?

Which type of membrane is commonly used as model membranes in experimental studies?

What is the process called when a lipid bilayer changes from a liquid state to a two-dimensional rigid crystalline state?

Which of the following is NOT a factor that affects the fluidity of a lipid bilayer?

What is the term for the movement of phospholipids within the lipid bilayer?

What is the process called when lipids flip from one side of the lipid bilayer to the other?

What type of microscopy technique is used to demonstrate lateral diffusion in membranes?

Which of the following is a common function of the extracellular matrix (ECM)?

What is the role of fibroblasts in the ECM?

Which type of connective tissue consists of collagen fibers and bone mineral?

What is the main function of glycosaminoglycans (GAGs) in the ECM?

Which class of macromolecules in the ECM is rich in proline and glycine amino acids?

What are collagen fibrils?

Which protein is responsible for giving tissues their elasticity, such as skin, blood vessels, and lungs?

What type of bonds join the molecules of elastin together to generate a cross-linked network?

Which protein plays an important role in tissue repair, regulating cell attachment and motility, and embryogenesis?

What is the primary organizer of the sheet structure of the basal lamina?

Which family of transmembrane proteins facilitate cell adhesion and mediate cellular signals?

Which type of bonds hold the three long polypeptide chains of laminin together?

Which state is the lipid bilayer in at low temperatures?

What effect do unsaturated fatty acids have on the melting point of the lipid bilayer?

What effect does cholesterol have on the fluidity of the membrane at high temperatures?

What is the role of cis-double bonds in membrane phospholipids?

What is the function of cholesterol in the lipid bilayer?

What effect does a shorter hydrocarbon chain have on the fluidity of the membrane at lower temperatures?

More Quizzes Like This

Cell Membrane Fluidity

Cell Membrane Fluidity

Cell Membrane Dynamics Quiz

Abnormalities of Cell Membrane - Quiz

Upgrade to continue