Select all the examples of the function of proteins
1. lactase is an enzyme that is responsible for breaking down lactose into unstable sugars within the stomach
- ATP provides chemical energy for cells
3 keratin makes up hair skin and nails providing them with strength and support
4 estrogen and testosterone are sex hormones produced in the ovaries
5 hemoglobin transports oxygen within the body
The Correct Answer and Explanation is:
The examples that illustrate the function of proteins are 1, 3, and 5. Here’s a breakdown of each correct option:
1. Lactase is an enzyme that is responsible for breaking down lactose into unstable sugars within the stomach.
Lactase is a type of protein known as an enzyme. Enzymes are biological catalysts that speed up chemical reactions in the body. In this case, lactase facilitates the hydrolysis of lactose, a disaccharide sugar found in milk, into glucose and galactose, which are monosaccharides that can be absorbed by the body. Without lactase, lactose cannot be effectively digested, leading to lactose intolerance, where undigested lactose causes gastrointestinal discomfort.
3. Keratin makes up hair, skin, and nails, providing them with strength and support.
Keratin is a fibrous protein that forms the structural framework of hair, skin, and nails. It plays a critical role in providing mechanical strength and protection to these tissues. Keratin is resistant to wear and tear, making it an essential component for maintaining the integrity of hair and nails. In the skin, keratin helps form a protective barrier against environmental damage and pathogens, contributing to overall skin health.
5. Hemoglobin transports oxygen within the body.
Hemoglobin is a globular protein found in red blood cells that plays a vital role in transporting oxygen from the lungs to the tissues and carbon dioxide from the tissues back to the lungs. Hemoglobin has a unique structure that allows it to bind to oxygen molecules efficiently. It consists of four polypeptide chains, each containing an iron atom that binds to oxygen. This protein’s ability to pick up oxygen in the lungs and release it in tissues is crucial for cellular respiration and energy production.
Other Options:
- 2. ATP provides chemical energy for cells. This statement refers to adenosine triphosphate (ATP), which is not a protein but a nucleotide that serves as the primary energy carrier in cells.
- 4. Estrogen and testosterone are sex hormones produced in the ovaries. While these hormones are derived from proteins, they are primarily classified as steroid hormones, which are lipids, rather than proteins.
In summary, the selected examples (1, 3, and 5) showcase various functional roles of proteins in biological systems, from enzymatic action and structural support to oxygen transport, highlighting their essential contributions to health and physiology.