Question

put a check next to the structures made of proteins. finger and toe nails cell membrane dna hair muscles

Explanation:

Finger and toe nails are made of a protein - keratin. Hair is also made of keratin protein. Muscles are composed of muscle proteins like actin and myosin. The cell membrane has proteins embedded in a lipid - bilayer but is not primarily made of proteins. DNA is a nucleic acid, not a protein.

Answer:

• finger and toe nails: √
• cell membrane:
• DNA:
• hair: √
• muscles: √