Cell Membrane Structure and Function Quiz

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What type of movement involves lipids rotating in place?

Lateral diffusion lipid movement

Transverse diffusion lipid movement

Linear lipid movement

Rotational lipid movement (correct)

Which type of movement involves lipids moving from high concentration areas to low concentration areas without energy input?

Transverse diffusion lipid movement

Rotational lipid movement

Radial lipid movement

Lateral diffusion lipid movement (correct)

Why is transverse diffusion lipid movement considered the least common type of movement?

It involves hydrophilic heads passing through the hydrophobic core of the membrane (correct)

It involves lipids rotating in place

It is thermodynamically favorable

It requires energy input

Which type of movement involves proteins called flipases using ATP to power the process?

Transverse diffusion lipid movement Signup and view all the answers

What keeps lipids together in a membrane as mentioned in the text?

Hydrophobic interactions Signup and view all the answers

What is the term used for the movement of lipids in relation to one another?

Lateral diffusion lipid movement Signup and view all the answers

What is the primary function of the proteins on the apical surface of a polarized cell?

To regulate nutrient uptake Signup and view all the answers

What is the primary role of the spectrin network on the cytoplasmic side of the plasma membrane?

To provide rigidity to the membrane Signup and view all the answers

What is the primary function of the lateral proteins in a polarized cell?

To allow communication with neighboring cells Signup and view all the answers

What is the primary purpose of the selective permeability of the cell membrane?

To allow for extensive compartmentalization inside the cell Signup and view all the answers

What is the primary mechanism by which the cell membrane acts as a selective barrier?

By allowing some materials to pass through while prohibiting others Signup and view all the answers

What is the main function of flipases in the membrane?

Maintaining an asymmetry of lipids in the membrane Signup and view all the answers

How are transmembrane domains typically structured?

They consist of hydrophobic amino acids in an alpha helix Signup and view all the answers

What can be inferred about soluble proteins according to the text?

Soluble proteins can be separated by gel electrophoresis Signup and view all the answers

Which characteristic is associated with insoluble proteins?

Interaction with hydrophobic fatty acid tails Signup and view all the answers

What creates lipid rafts in the membrane?

High concentration of saturated fatty acids and cholesterol Signup and view all the answers

How are hydrophobicity plots used in determining protein structure?

To visualize how a protein will look like in the membrane Signup and view all the answers

Which of the following statements about tight junctions is correct?

They allow the movement of large macromolecules and ions across the membrane. Signup and view all the answers

According to the fluid mosaic model, what is the primary factor that affects the fluidity of a membrane?

The ratio of saturated to unsaturated fatty acids in the membrane. Signup and view all the answers

What is the primary function of cholesterol in a membrane?

To increase the hydrophobic interactions between lipids. Signup and view all the answers

In the FRAP technique, what does the x-axis represent?

Time. Signup and view all the answers

What is the primary function of the phospholipid bilayer in a membrane?

To create a selectively permeable barrier between the cell and its environment. Signup and view all the answers

Which of the following statements about membrane structure is correct?

The non-polar tails of phospholipids face inwards, and the polar heads face outwards. Signup and view all the answers