**Question: Which statement is TRUE regarding complete proteins?**1. Complete proteins can be synthesized from carbon skeletons.2. Complete proteins can only be obtained from animal proteins.3. Complete proteins lack one or more essential amino acids.4. Complete proteins provide all of the essential amino acids. (Note: This is presented as a multiple-choice question with one option selected. It is important for the students to understand that only one of these statements accurately defines complete proteins.)

The need for protein in the diet is to repair body cells and make new ones. The main role of dietary protein is in body-building. The proteins are the fundamental basis of cell structure and function. They also serve as major suppliers of energy during starvation. Proteins act as enzymes, some hormones, and immunoglobulins. It also maintains the osmotic pressure in the cells. The nutritional importance of proteins is based on their content of essential amino acids. A food is considered a complete protein when it contains the nine essential amino acids that our body cannot produce on its own. Histidine, arginine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine are essential amino acids. Proteins can be classified as complete and incomplete based on the amino acids that they contain. Incomplete proteins are deficient in one or more of the essential amino acids. While the complete proteins contain all the essential amino acids that are required by the body. These proteins have to be supplied to the body through the diet.The protein is considered complete when it provides nine essential amino acids out of ten. Proteins are the major sources of nitrogen in the body. Most plant-based sources of protein are considered to be incomplete because they are low in one or more essential amino acids. Quinoa and soy are plant-based complete proteins. The incomplete proteins lack a few essential amino acids. Ans: Usually, the animal proteins are complete. In order to fulfill the requirements of the body and to receive all the essential amino acids, fish, eggs, and meat are the best choices. They provide the required proportion of the essential amino acids to the body. The egg is considered 100% complete, it contains all the essential amino acids required by the body. Animal proteins are complete, including meat, poultry, fish, eggs, and dairy. Meat, poultry, eggs, dairy, and fish are complete sources of protein because they contain all 9 essential amino acids. These are considered to be complete sources of protein because they contain all of the essential amino acids that your body needs to function effectively. This means they supply all of the amino acids the body can't make on its own. Most plant proteins are incomplete.