Question

Choose the correct statements about lipid bilayers

Evr, The following Lipid raft Phospholipid Sphingolipid Cholesterol question is related to the image below: You are working in a lab and have tagged the above cell membrane with fluorescent tags. Select the true statement(s) out of the following O The yellow portions are typically sites of cell signaling for protein receptors, while the red portions contain fatty acid derivatives and help maintain membrane fluidity O The yellow portions contain a glycerol backbone attached to two fatty acid groups, while the red portion helps maintain membrane fluidity, is the most abundant form of lipids in the cell membrane, and is typically a site of cell signaling for protein receptors. O The yellow portions are the most abundant forms of lipids in the cell membrane and contain a glycerol backbone, while the red portions contain fatty acid derivatives, help maintain membrane fluidity, and are typically sites of cell signaling for protein receptors. The red portions are typically sites of cell signaling for protein receptors and help maintain membrane fluidity, while the yellow portions contain carbohydrate head groups and are the most abundant forms of lipids in the cell membrane.

Answer 1

Statement 3 and 4 are correct.

Yellow portions are phospholipids which is the most predominant constituent of the cell membrane. It contains a glycerol backbone attached to two fatty acid chains. These chains extend towards the interior of the membrane while the polar head groups of phospholipids face the outside of the membrane. Such head groups can be carbohydrate head groups (like inositol head group).

The red portions are sphingolipids that are the second most abundant constituent of the cell membrane. It is a fatty acid derivative with a ceramide backbone attached to two fatty acid chains, helps maintaining membrane fluidity and are sites for cell signalling.