Question

Which three of the following are major functions of proteins

1- store energy
2- act as chemical messengers
3- major components of cell membranes
4- receptors of chemical signals
5- source of fibers
6- major component of skeletal muscle

Answer 1

Proteins serve many essential functions, including acting as chemical messengers, forming major components of cell membranes, and functioning as receptors for chemical signals.

Step-by-step explanation:

The three major functions of proteins that are listed among the options provided are:

1. Act as chemical messengers: Proteins such as hormones serve as chemical messengers that help regulate body functions.
2. Major components of cell membranes: Proteins like phospholipids are essential in forming the cell membranes that enclose cells.
3. Receptors of chemical signals: Proteins also function as receptors on cell surfaces to receive and process various chemical signals.

Proteins serve a vast array of functions in the body, and besides these three roles, they are also crucial for structural support through collagen and keratin, for muscle contraction through actin and myosin, and for transporting substances like oxygen via hemoglobin.