Question

select all that apply
choose all the statements that are true of proteins.
□ they carry the instructions that control a cells activities.
□ they act as receptors on cells surfaces.
□ they make up one of the subunits, or building blocks, of triglycerides.
□ they catalyze chemical reactions.
□ they make up molecules that can transport oxygen.

Explanation:

• DNA, not proteins, carries instructions that control a cell's activities.
• Proteins can act as receptors on cell surfaces for signal - recognition.
• Fatty acids and glycerol make up triglycerides, not proteins.
• Enzymes (a type of protein) can catalyze chemical reactions.
• Hemoglobin, a protein, can transport oxygen.

Answer:

They act as receptors on cells' surfaces.
They catalyze chemical reactions.
They make up molecules that can transport oxygen.