Enzymes

Enzymes are protein molecules that are described as biological catalysts. A catalyst is a molecule which speeds up a chemical reaction but remains unchanged at the end of it. Every metabolic reaction that takes place within a living organism is catalysed by an enzyme  and therefore they are essential for life to exist. Enzyme names…

cell membranes and transport

All living cells are surrounded by a very thin membrane - cell surface membrane. controls exchange of material such as nutrients and waste product between cell and environment. regulates transport across membranes of organelles enables cells to receive hormone messages   Phospholipid - a lipid containing a phosphate group in its molecule. Phospholipids - little…

Biological Molecules

Metabolism - some of the total metabolic reactions in the body. Organic molecule - a compound containing carbon and hydrogen Macromolecules, giant molecule: polysaccharides, proteins (polypeptide) and nucleic acids (polynucleotides) Molecules are polymers, made up of many repeating subunits monomers Monosaccharides =) polysaccharides Amino acids =) proteins nucleotides + organic bases =) nucleic acids Fatty…