So,
Living things are made of four types of molecules, known as macromolecules. These macromolecules are:
1. Carbohydrates:
Carbohydrates, are sugar molecules. Along with proteins and fats, carbohydrates are one of three main nutrients found in foods and drinks. Your body breaks down carbohydrates into glucose. Glucose, or blood sugar, is the main source of energy for your body's cells, tissues, and organs. The building blocks units of Carbohydrates are called Monosaccharides, which are simple sugars. The next one is a picture that shows the structures of some Carbohydrates:
2. Lipids:
A lipid is any of various organic compounds that are insoluble in water. They include fats, waxes, oils, hormones, and certain components of membranes and function as energy-storage molecules and chemical messengers. The building block units of lipids are Fatty acids and glycerol.
We can see some structures for lipids below:
3. Proteins:
Proteins are large, complex molecules that play many critical roles in the body. They do most of the work in cells and are required for the structure, function, and regulation of the body's tissues and organs.
A protein is a naturally occurring, extremely complex substance that consists of amino acid residues joined by peptide bonds. Proteins are present in all living organisms and include many essential biological compounds such as enzymes, hormones, and antibodies as well. The building block units of proteins are called Aminoacids.
A protein has four structures shown below:
And, finally:
4. Nucleic acids:
Nucleic acids are naturally occurring chemical compounds that serve as the primary information-carrying molecules in cells.
They play an especially important role in directing protein synthesis. The two main classes of nucleic acids are deoxyribonucleic acid (DNA) and ribonucleic acid (RNA).
The building block units of nucleic acids are called Nucleotides.
The next one is their structure:
