Which of the following organic molecules contains both an amine and a carboxyl group?

Rationale

Proteins contain both an amine and a carboxyl group.

Proteins are polymers of amino acids, and each amino acid contains both an amine (-NH2) and a carboxyl (-COOH) group. These functional groups are involved in the formation of peptide bonds that link amino acids together to form proteins.

A (Lipids) YOUR ANSWER

Lipids are a diverse group of hydrophobic molecules that include fats, oils, waxes, and sterols. They are composed primarily of hydrocarbons and do not typically contain either amine or carboxyl groups. Lipids are primarily involved in energy storage, insulation, and forming the structural components of cell membranes.

B (Cellulose) YOUR ANSWER

Cellulose is a complex carbohydrate composed of glucose units. It does not contain an amine group or a carboxyl group. It is a primary structural component of plant cell walls and serves as a source of dietary fiber in human nutrition.

C (Chitin) YOUR ANSWER

Chitin is a polysaccharide that contains amino sugars, but it does not have a carboxyl group. Chitin is found in the exoskeletons of arthropods like insects and crustaceans, and in the cell walls of many fungi.

D (Proteins) CORRECT

Proteins are made up of amino acids, each of which contains both an amine group and a carboxyl group. These groups are involved in forming peptide bonds that link the amino acids together. The sequence and structure of these amino acids determine the protein's specific function in the body.

Conclusion

Out of the given options, only proteins contain both an amine and a carboxyl group. These groups are a fundamental part of the structure of amino acids, the building blocks of proteins. Lipids, cellulose, and chitin, while important organic molecules, do not possess both these functional groups. Understanding the structure and function of these molecules is key to understanding biology at the molecular level.

Which of the following organic molecules contains both an amine and a carboxyl group?

Proteins contain both an amine and a carboxyl group.

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