Glycosidic bond: a C–O–C link between two sugar molecules, formed by a condensation reaction; it is a covalent bond.

Genetic drift is the gradual change in allele frequencies in a small population, where some alleles are lost or favoured.

Phloem contains tubes called sieve tubes that are made from cells called sieve tube elements.

Atrial systole is the stage of the cardiac cycle when the muscle in the walls of the atria contracts.

The Okazaki fragments are formed the parent strand that runs in the 5′ to 3′ direction.

Node of Ranvier is a very short gap between Schwann cells where myelinated axons are not covered in myelin so are exposed to tissue fluid.

Increasing the substrate concentration may stop the the works of competitive inhibitor.

Glycolysis is the splitting, or lysis, of glucose. It takes place in the cytoplasm of a cell.

Antibiotic resistance arises by mutation and becomes widespread when antibiotics are overused.

Oxygen diffuses down its concentration gradient from the air in the alveoli to the blood, and carbon dioxide diffuses down its concentration gradient in the opposite direction.

The pigments in a thylakoid membrane are arranged in clusters called photosystems.

The cells in your body vary in size from about 5 μm to 40 μm.