The four macromolecules essential to organisms, or living things, are carbohydrates, lipids, proteins, and nucleic acids. Carbohydrates are the molecules that are in sugars, fibers, and starches. Carbohydrates are mainly found in breads, grains, fruits, vegetables, and dairy.

 Carbohydrates

   Functions of Carbohydrates

The most important function of carbohydrates is to give our body energy. Carbohydrates are the main source of energy for our bodies and they are essential for all living things. In order to get the energy, our body has to digest, or break down and process the carbohydrates into glucose, fructose, and galactose, or a simple sugar that  is used for energy.

    Lipids

Lipids, or fats, are found in every cell of the body. Lipids can be found in fatty meats, butter, cheese, and foods with a high fat content. Lipids are able to store the most energy and is used as long-term energy for living things.

 Functions of Lipids

The main functions of lipids is to store energy, make up the cell membrane, to create hormones, helps create bile, and insulating your body. The cell membrane is important in each cell because it helps keep it from leaking . Creating bile helps dissolves fat in the body and insulating your body helps to keep your internal body temperature regular.

  Proteins

Proteins are found in almost muscle, tissue, and bone in the body. There are thousands of different types of proteins our body uses to keep it functioning. Proteins can be found in foods such as fish, meat, milk, eggs, soy and nuts.

  Amino Acids

Amino acids are the building blocks of proteins and our body must make amino acids and get them from food sources. In a protein, amino acids are linked together by Peptide bonds. There are 9 amino acids that are essential to are bodies and they are only found in foods, meaning our body cannot make them. Amino acids are combined with each other to make thousands of different proteins.

Functions of Proteins

Proteins have six important functions for organisms: to grow and repair cuts and injuries, a major source of energy, used as a creation for some hormones, to make enzymes, transports and stores molecules, and to help form antibodies. Proteins are very important for the body and it is important for proteins to make enzymes to help speed up chemical reactions.

 Nucleic Acids

Nucleic acids are composed of long chains of nucleotides that are linked by dehydration synthesis, a type of chemical reaction in the body. Nucleic acids are found in the nucleus of every cell and it can be found in foods such as meats and fish.