Cell Biology and Human Genetics: Biological Membranes Part I

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Which type of proteins can be extracted with Phospholipase C?

Lipid-anchored proteins
Peripheral proteins
GPI-proteins (correct)
Beta-Barrel proteins

How are lipid-anchored proteins bound to the membrane?

Connected through disulfide bonds
Directly inserted into the phospholipid bilayer
Covalently bound to the lipid (correct)
Associated through non-covalent interactions

Which type of proteins can be dissociated from the membrane by changes in pH or high concentration of salts?

Exoplasmic proteins (correct)
Permeable proteins
Transmembrane proteins
GPI-proteins

Where are GPI-proteins typically found in relation to the membrane?

Outer side of the membrane (D) Signup and view all the answers

How do integral membrane proteins anchor themselves to the lipid bilayer?

By embedding hydrophobic chains into the membrane leaf (C) Signup and view all the answers

Which type of interactions associate peripheral proteins with transmembrane proteins?

Non-covalent interactions (C) Signup and view all the answers

Which of the following is NOT a function of the cell membrane?

Synthesizing new proteins for the cell (D) Signup and view all the answers

Which of the following factors can influence the fluidity of a biological membrane?

All of the above (D) Signup and view all the answers

What is the primary function of lipid rafts in the cell membrane?

To serve as platforms for the organization and regulation of membrane proteins (D) Signup and view all the answers

Which of the following statements about the structure of the cell membrane is correct?

The cell membrane is a fluid mosaic structure with proteins embedded in a phospholipid bilayer (C) Signup and view all the answers

Which of the following membrane components is primarily responsible for establishing intercellular communication?

Membrane proteins (D) Signup and view all the answers

Which of the following statements about the carbohydrate fraction of the cell membrane is correct?

The carbohydrate fraction is involved in cell-cell recognition and adhesion (C) Signup and view all the answers

Which statement about biological membranes is incorrect?

They are rigid structures that do not allow changes in cellular shape or morphology. (C) Signup and view all the answers

The plasma membrane is described as having a characteristic 'railroad track' appearance due to:

The presence of two polar layers, consistent with the phospholipid bilayer structure. (D) Signup and view all the answers

What is the approximate width of the plasma membrane, according to the text?

$75 \AA$ (Angstroms) (C) Signup and view all the answers

Which of the following is not a function of biological membranes?

Photosynthesis (B) Signup and view all the answers

What technique is used to obtain the characteristic 'railroad track' appearance of the plasma membrane?

Cryofracture of cells and electron microscopy (C) Signup and view all the answers

What is the approximate conversion factor between Angstroms (Å) and nanometers (nm)?

$1 \AA = 0.1 \text{nm}$ (C) Signup and view all the answers