Phospholipid Bilayer Questions with Complete Correct Answers | Grade A+

What is the basic framework of biological membranes? Ans: The phospholipid bilayer What are the 3 components of the phospholipid bilayer? Ans: Phospholipids, proteins, carbohydrates How is the phospholipid bilayer divided? Ans: Into asymmetrical leaflets What does it mean for the membrane to be semifluid? Ans: Phospholipids move laterally and rotationally, but not in 3 dimensions (no ATP required) What does it mean for phospholipids to flip flop? Ans: Phospholipids turn upside down and move to the opposite leaflet requiring ATP 2 What aspects of lipid composition affect membrane fluidity? Ans: The length of the tail (longer = less fluidity due to more interaction) double bonds in the tail (more double bonds = more fluidity) What type of cells is cholesterol present in? Ans: Animal cells How does cholesterol affect membrane fluidity? Ans: As temperature increases cholesterol restricts phospholipid movement, as temperature decreases cholesterol increases membrane fluidity Why does membrane fluidity mat