18 Questions
Which type of proteins can be extracted with Phospholipase C?
GPI-proteins
How are lipid-anchored proteins bound to the membrane?
Covalently bound to the lipid
Which type of proteins can be dissociated from the membrane by changes in pH or high concentration of salts?
Exoplasmic proteins
Where are GPI-proteins typically found in relation to the membrane?
Outer side of the membrane
How do integral membrane proteins anchor themselves to the lipid bilayer?
By embedding hydrophobic chains into the membrane leaf
Which type of interactions associate peripheral proteins with transmembrane proteins?
Non-covalent interactions
Which of the following is NOT a function of the cell membrane?
Synthesizing new proteins for the cell
Which of the following factors can influence the fluidity of a biological membrane?
All of the above
What is the primary function of lipid rafts in the cell membrane?
To serve as platforms for the organization and regulation of membrane proteins
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
Which of the following membrane components is primarily responsible for establishing intercellular communication?
Membrane proteins
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
Which statement about biological membranes is incorrect?
They are rigid structures that do not allow changes in cellular shape or morphology.
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.
What is the approximate width of the plasma membrane, according to the text?
$75 \AA$ (Angstroms)
Which of the following is not a function of biological membranes?
Photosynthesis
What technique is used to obtain the characteristic 'railroad track' appearance of the plasma membrane?
Cryofracture of cells and electron microscopy
What is the approximate conversion factor between Angstroms (Å) and nanometers (nm)?
$1 \AA = 0.1 \text{nm}$
This quiz covers Lesson 2 on Biological Membranes, focusing on the structure, components, and basic functions. Topics include general characteristics, membrane structure, chemical composition, factors affecting fluidity, the carbohydrate fraction, and types of membranes.
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