Final answer:
The substances listed in the question are primarily composed of proteins, important organic molecules necessary for the structure and function of living cells and tissues.
Step-by-step explanation:
Among the options given, the substances listed such as meat, poultry, fish, quinoa, along with muscles, hair, nails, and cell membrane are primarily composed of proteins. Proteins are organic molecules made up of amino acids linked by peptide bonds and are essential for the structure and function of living cells and tissues. They are categorized as macronutrients and play a vital role in building and repairing tissues, making enzymes and hormones, and supporting immune function. In contrast to proteins, macronutrients like carbohydrates and lipids provide energy, whereas macronutrients like vitamins and minerals aid in controlling body processes.
Carbohydrates, lipids, and proteins are micronutrients. Macronutrients are vitamins and minerals.
Proteins are critical components of all tissues and organs. They are organic molecules composed of amino acids and play a crucial role in various bodily functions. Examples include muscles, hair, nails, and the cell membrane.
Proteins are also found in skin, bones, enzymes, antibodies, neurotransmitters, and hormones. They contain nitrogen and sometimes sulfur in addition to carbon, hydrogen, and oxygen.