A sub-cellular structure that contains chromosomes made of DNA molecules.

The entire genetic material of an organism.

A cell or organism which has a cell membrane, cytoplasm and genetic material enclosed in a nucleus.

A small ring of DNA found in a bacterial cell.

An organism whose cell has cytoplasm and a cell membrane surrounded by a cell wall. The genetic material is not enclosed in a nucleus.

Classifying organisms as eukaryotic or prokaryotic

Combined science

Electron microscopy, and the size and scale of cells: including standard form

Classification into kingdoms and domains: sub-cellular evidence

Classification and reclassification: genetic evidence

Pupils learned that random genetic mutation is a source of heritable variation, and that evolution occurs through the natural selection of genetic variants linked to advantageous phenotypes.

This unit explores the impact of biology developments on classification systems, highlighting how electron microscopy enhances understanding of sub-cellular structures. It covers eukaryotic and prokaryotic cells, quantitative skills, unit conversions, and the evolution of scientific methods.

Classification in modern biology

Which of the following are membrane bound sub-cellular structures?

Which of the following are features of eukaryotic cells but not prokaryotic cells?

Is a cell with a diameter of 0.2 μm prokaryotic or eukaryotic?

What is the name given to the small rings of DNA that are sometimes found in prokaryotic bacterial cells?

Which type of organism has cells that have DNA enclosed in a nucleus but no cell wall?

The genetic material of a cell is composed of a chemical called ...

Which sub-cellular structure contains DNA?

Which of the following organisms are multicellular?

Which sub-cellular structure is the site of respiration?

Which of the following is part of a plant cell but not part of an animal cell?

Classifying organisms as eukaryotic or prokaryotic

Lesson outcome