Podcast
Questions and Answers
What is the reason behind lipid bilayers being asymmetric?
What is the reason behind lipid bilayers being asymmetric?
- Phosphatidylserine is present in both leaflets
- Only glycosphingolipids are present in the bilayer
- Cellular energy is used to maintain the asymmetry (correct)
- Random distribution of lipids in the bilayer
Which type of integral membrane protein has a hydrophilic interior and hydrophobic exterior?
Which type of integral membrane protein has a hydrophilic interior and hydrophobic exterior?
- Alpha-helical proteins
- Beta-barrel proteins (correct)
- Peripheral membrane proteins
- Lipid-linked membrane proteins
What is the minimum number of hydrophobic residues required for an alpha-helical protein to cross the membrane once?
What is the minimum number of hydrophobic residues required for an alpha-helical protein to cross the membrane once?
- 20-30 (correct)
- 10-15
- 15-20
- 30-40
What is the main difference between peripheral membrane proteins and lipid-linked membrane proteins?
What is the main difference between peripheral membrane proteins and lipid-linked membrane proteins?
Which type of lipid is usually found on the outer leaflet of the lipid bilayer?
Which type of lipid is usually found on the outer leaflet of the lipid bilayer?
What is the characteristic of the 1st strand of a beta-barrel protein?
What is the characteristic of the 1st strand of a beta-barrel protein?
What is the primary function of TAGs in most organisms?
What is the primary function of TAGs in most organisms?
What is the difference between phospholipids and TAGs?
What is the difference between phospholipids and TAGs?
What is the characteristic of the head group of phospholipids?
What is the characteristic of the head group of phospholipids?
What is the function of phospholipases?
What is the function of phospholipases?
What is the main difference between phospholipids and sphingolipids?
What is the main difference between phospholipids and sphingolipids?
What are the main components of biological membranes?
What are the main components of biological membranes?
What is the main factor that determines the fluidity of a lipid bilayer?
What is the main factor that determines the fluidity of a lipid bilayer?
How does cholesterol influence membrane fluidity?
How does cholesterol influence membrane fluidity?
What is the main reason why lipids rarely flip from one leaflet to the other in a membrane?
What is the main reason why lipids rarely flip from one leaflet to the other in a membrane?
What is the typical distribution of lipids in a cell membrane?
What is the typical distribution of lipids in a cell membrane?
Why do polar head groups of lipids face outward in a membrane?
Why do polar head groups of lipids face outward in a membrane?
What is the result of having lots of long and saturated lipids in a membrane?
What is the result of having lots of long and saturated lipids in a membrane?
