Question

Which statement best describes the structure of a lipid molecule?

A phospholipid has a charged head and an uncharged tail.
A lipid is made up of a long chain of phosphorus molecules.
Lipids contain proteins and glycerol.
The ends of the lipid are attached to each other.​

Answer 1

Phospholipids are amphipathic molecules that form a bilayer in a cell membrane.

Step-by-step explanation:

A phospholipid is an amphipathic molecule, meaning it has a hydrophilic and a hydrophobic part. The "head" is composed of the hydrophilic phosphate group, and the “tail” contains the hydrophobic fatty acids. In a membrane, a bilayer of phospholipids is formed, with the hydrophilic heads facing the aqueous environment both inside and outside the cell, while the hydrophobic tails face each other. This structure allows phospholipids to form a two-layer cell membrane.

Answer 2

A phospholipid has a charged head and an uncharged tail.