The amino acid at the end of a polypeptide chain, which contains a free carboxyl group (-COOH).

A unit of volume equal to the space occupied by a cube with 1-centimeter sides, commonly used to measure liquids or solids in small quantities.

The stem of certain plants, particularly grasses, that is hollow and jointed.

A plant variety that has been produced through selective breeding to enhance specific traits, such as color or disease resistance.

The cultivation of microorganisms, cells, or tissues in a controlled environment, typically for research or industrial purposes.

Shaped like a wedge or a triangle, often used to describe certain plant leaves or anatomical structures.

An ancient system of writing used in Mesopotamia, characterized by wedge-shaped marks made on clay tablets.

A small cup-like structure, often found in plants, that holds seeds or fruits.

A unit of radioactivity, named after Marie and Pierre Curie, used to measure the decay of radioactive substances.

A pointed or rounded projection or point, such as those found on teeth or leaves.