Almost everything with a structural function, enzymes, pores in the cell membrane to pump ions, receptors, etc.
proteins
potassium
all living organisms need nitrigen to build proteins
Originally, in the early 1900's, they were. However, with genetics becoming more popular, they found out DNA was the actual blueprint of life. but, DNA codes to build proteins, which controls the cell.
They are digestive juices, and are needed to build up the digestive systemTo make proteins (to build a body).
amino acids proteins carbohydrates
There are 20 different amino acids that are commonly used to build proteins in organisms. These amino acids combine in various sequences to form the vast array of proteins necessary for life. While some organisms can produce certain amino acids, others must obtain them through their diet, classifying them as essential or non-essential amino acids.
Proteins are used to build the tissue. Proteins are eaten first. They are broken down to amino acids in digestive tract. Then they are assembled as per your body proteins. Then they are used as per requirement of your body tissue.
Living organisms require nitrogen to make nitrates and nitrites, which are used to build proteins and nucleic acids like DNA and RNA. Nitrogen is an essential component of these macromolecules, which are crucial for the growth and functioning of cells in living organisms.
Proteins help chilgren grow and build mucle.In adults protein is needed to replace or repair damaged cells.So yes it is important.
Proteins store energy in living organisms by converting excess energy from food into chemical bonds within their structure. This stored energy can be released when needed for various cellular processes.
To avoid wasting energy and resources on producing proteins that are not needed nor are already available.