A scientist observes an unspecialised animal cell as an organism develops.
Which observation provides evidence that the cell has become specialised?
It divides and forms two unspecialised animal cells.
It grows long extensions and begins carrying electrical impulses.
It makes proteins at ribosomes in its cytoplasm.
It transfers energy by aerobic respiration in its mitochondria.
282 exam-style questions on AQA GCSE Biology 1.1 Cell structure, covering 1.1.1 Eukaryotes and prokaryotes, 1.1.2 Animal and plant cells, 1.1.3 Cell specialisation, 1.1.4 Cell differentiation, 1.1.5 Microscopy, and 1.1.6 Culturing microorganisms. Each one has a worked solution and a mark scheme showing where the marks go.