Question

select the tubes that contain protein. select all that apply. tube 1: pepsin tube 2: albumin tube 3: starch tube 4: water

Explanation:

Pepsin is an enzyme which is a protein. Albumin is a protein in blood plasma. Starch is a carbohydrate and water is a simple compound, neither are proteins.

Answer:

Tube 1: Pepsin, Tube 2: Albumin