The structure of proteins
The structure and arrangement of polypeptide chains affects the spatial structure of proteins.
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Amino acids are the monomers of proteins.
Enzymes are protein molecules catalysing biochemical reactions. Their activity can be regulated.
Fibroin is a fibrillar protein excreted by silkworms.
Oxygen carrier protein in our red blood cells.
Amino acids that make up proteins are bound by peptide bonds.
While the density of spider silk is less than that of nylon filaments, its tensile strength is greater than that of steel.
Human blood consists of blood cells and plasma.
Polypeptide chains are composed of amino acids and can appear in alpha-helix or beta-sheet form.
This animation explains active and passive transport processes occurring through cell membranes
Eukaryotic cells with nuclei measuring only a few micrometres may contain nearly 2 metres of DNA, coiled multiple times.
Eukaryotic cells contain a number of organelles.
Bacteria occur in a wide range of shapes, including spheres, rods and spirals.
Polymerised ethylene is known as polyethylene, a type of plastic.
Viruses consist of protein and DNA or RNA; they reprogram infected cells to produce more viruses.