This common misconceptions covers Common Misconceptions within Cell Structure for GCSE Biology. Cell theory, prokaryotic and eukaryotic cells, animal and plant cell organelles, bacterial cells, specialized cells, and microscopy It is section 12 of 17 in this topic. Use this common misconceptions to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 12 of 17
Practice
20 questions
Recall
25 flashcards
❌ Common Misconceptions
Misconception 1: "All cells have a nucleus."
This is false in two important ways. Red blood cells lose their nucleus during development so they can carry more haemoglobin. More broadly, prokaryotic cells (like bacteria) do not have a true nucleus — their DNA floats freely in the cytoplasm rather than being enclosed in a nuclear membrane. When an exam question asks "do all cells have a nucleus?", the answer is no.
Misconception 2: "Plant cells don't have mitochondria."
Plant cells do have mitochondria. The confusion comes from the fact that plants photosynthesise (using chloroplasts), so students assume they don't need to respire. In reality, ALL living cells carry out aerobic respiration — including plant cells. Mitochondria are present in plant cells and are just as active as in animal cells. Photosynthesis and respiration are separate processes that both occur in plants.
Misconception 3: "Bigger organisms have bigger cells."
Larger organisms do not have larger individual cells. A blue whale and a mouse have cells that are approximately the same size (roughly 10–30 μm for typical animal cells). What differs is the number of cells. A larger organism simply has far more cells. Cell size is constrained by the surface area to volume ratio — a cell must be small enough for substances to diffuse in and out efficiently.