a lipid in a membrane an enzyme in a lysosome a polysaccharide in a cell wall a DNA molecule in a mitochondrion
I gave my students this multiple choice question: A scientist uses a special chemical marker to label some amino acids. He follows the marker until it becomes part of a large molecule in a cell. Which molecule does he find the chemical marker on?

Only one answer is correct among these 4 choices:
- a lipid in a membrane
- an enzyme in a lysosome
- a polysaccharide in a cell wall
- a DNA molecule in a mitochondrion

Could you tell me which one is correct?

an enzyme in a lysosome