Painted animal cell showing nucleus (dark blue with purple nucleolus), olive-green mitochondria with internal cristae, brown ribosomes scattered throughout, and cell membrane outline. 5 labelled callouts cover nucleus (contains DNA), mitochondria (aerobic respiration), ribosomes (protein synthesis), cytoplasm (chemical reactions), cell membrane (controls entry/exit). Bottom parchment notes that animal cells lack chloroplasts, cell wall, and permanent vacuole.

Figure 1: Animal cell — all organelles labelled

This diagram covers Cell Structure Diagrams within Cell Organelles for GCSE Biology. Revise Cell Organelles in Cell Biology for GCSE Biology with 12 exam-style questions and 15 flashcards. This is a high-frequency topic, so it is worth revising until the explanation feels precise and repeatable. It is section 2 of 14 in this topic. Focus on the labels, the relationships between parts, and the explanation that turns the diagram into an exam-ready answer.

Practice questions for Cell Organelles

Scientists studying mitochondria use electron microscopes rather than light microscopes. Which statement correctly explains why electron microscopes are more useful for studying cell ultrastructure?

A. Electron microscopes produce a coloured image that makes organelles easier to identify
B. Electron microscopes have a higher resolution, so finer details of organelles can be seen
C. Electron microscopes allow scientists to study living cells in real time
D. Electron microscopes are cheaper and easier to use than light microscopes

1 markfoundation

The diameter of a ribosome is approximately 0.00002 mm. (a) Write this diameter in standard form, in millimetres. (b) Convert this diameter into nanometres (nm).

2 marksstandard

Quick recall flashcards

What is the difference between magnification and resolution?

Magnification: how many times larger the image is than the real object. Resolution: the ability to distinguish two nearby points as separate. A high-resolution image shows fine detail; high magnification of a low-resolution image just produces a blurry enlargement.

What is the formula for calculating magnification?

Magnification = image size ÷ real size (both measurements must be converted to the same units before dividing). For example, if an image measures 6000 μm across and the real object measures 2 μm across, the magnification is 6000 ÷ 2 = ×3000.

The City Inside Every Cell

How Do We Know? Microscopy, Magnification and Scale

Cell Structure Diagrams

Practice questions for Cell Organelles

Quick recall flashcards

12 questions on Cell Organelles: practise free