Question

Which diagram best represents the fluid-mosaic of a cell membrane?

Answer 1

D.
The black part circles with tails represent lipids (black part is hydrophilic head and tail is hydrophobic interior). The hydrophilic heads (black circles) should face the outside and inside surface as it is at those interfaces where they are confronted with aqueous environments (where they are happy) AND that organization allows the hydrophobic tails to be shielded from the water. So we can eliminate A and C.

Since proteins are often found to be spanning the membrane, not carbohydrates, we can eliminate B and pick D as the correct answer.

Answer 2

thanks