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Structure of proteins

Structure of proteins

The structure and arrangement of polypeptide chains affects the spatial structure of proteins.

Ķīmija

Atslēgvārdi

proteīns, olbaltumvielu molekula, primārā struktūra, sekundārā struktūra, terciārā struktūra, kvartāra struktūra, aminoskābju secība, alfa helix, beta lapa, aminoskābe, polipeptīds, peptīda saite, amīda saite, apakšvienība, ķīmija, Bioloģija, bioķīmija

Saistītie vienumi

Amino acids

Amino acids are the monomers of proteins.

Enzymes

Enzymes are protein molecules catalysing biochemical reactions. Their activity can be regulated.

Fibroin

Fibroin is a fibrillar protein excreted by silkworms.

Haemoglobin

Oxygen carrier protein in our red blood cells.

Peptide bond

Amino acids that make up proteins are bound by peptide bonds.

Secondary structure of proteins

Polypeptide chains are composed of amino acids and can appear in alpha-helix or beta-sheet form.

Spider silk, spider web

While the density of spider silk is less than that of nylon filaments, its tensile strength is greater than that of steel.

The human blood

Human blood consists of blood cells and plasma.

Transport processes

This animation explains active and passive transport processes occurring through cell membranes

Organisation of genetic material

Eukaryotic cells with nuclei measuring only a few micrometres may contain nearly 2 metres of DNA, coiled multiple times.

Animal and plant cells, cellular organelles

Eukaryotic cells contain a number of organelles.

Bacteria (spheres, rods, spirals)

Bacteria occur in a wide range of shapes, including spheres, rods and spirals.

Polymerisation of ethene

Polymerised ethylene is known as polyethylene, a type of plastic.

Viruses

Viruses consist of protein and DNA or RNA; they reprogram infected cells to produce more viruses.

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