Misconception 1: "Organelles float randomly around inside the cell"
This is incorrect. Organelles are held in fixed positions within the cell, connected by a network of membranes. Each organelle is located where it is needed â for example, mitochondria are concentrated near areas of high energy demand, and ribosomes are often found close to the nucleus. Organelles do not drift randomly.
Misconception 2: "Plant cells don't respire because they photosynthesise"
This is a very common mistake. Plant cells respire continuously â they use aerobic respiration in mitochondria just like animal cells. Photosynthesis (making glucose) and respiration (using glucose to release energy) are two separate processes that happen simultaneously. At night, when there is no light for photosynthesis, plants rely entirely on aerobic respiration. A plant cell with no mitochondria could not survive.
Misconception 3: "All cells have the same organelles in equal amounts"
False. The number and type of organelles in a cell directly reflects its function. Muscle cells need massive amounts of energy, so they are packed with mitochondria. Pancreatic cells secreting digestive enzymes have very active Golgi apparatus and huge numbers of ribosomes to keep up with protein production. Red blood cells lose their nucleus and mitochondria entirely to make more space for haemoglobin. Specialised cells are structurally adapted for their specific job.
This common misconceptions covers Common Misconceptions About Organelles 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 9 of 14 in this topic. Use this common misconceptions to connect the idea to the wider topic before moving on to questions and flashcards.
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?
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).