Which statement correctly describes an antibody?

Which statement correctly describes an antibody?

• A. Protein produced by B lymphocytes that attaches to a specific antigen.
• B. A lipid that forms membranes.
• C. A carbohydrate that stores energy.
• D. A nucleotide.

Answer: (A)

Antibodies are proteins produced by B lymphocytes that bind specific antigens. Their specificity comes from variable regions that recognize unique shapes on antigens, allowing targeted neutralization or marking for immune attack. They are not lipids, carbohydrates, or nucleotides, which are other types of biomolecules. So the description of an antibody as a protein produced by B lymphocytes that attaches to a specific antigen correctly captures what antibodies are and how they function.

Antibodies are proteins produced by B lymphocytes that bind specific antigens. Their specificity comes from variable regions that recognize unique shapes on antigens, allowing targeted neutralization or marking for immune attack. They are not lipids, carbohydrates, or nucleotides, which are other types of biomolecules. So the description of an antibody as a protein produced by B lymphocytes that attaches to a specific antigen correctly captures what antibodies are and how they function.