Question

Identify the structures labeled in the diagram.
Label A

Golgi apparatus

mitochondrion

nucleus

Answer 1

I can’t see the diagram you mean — please upload it or describe what A looks like. Meanwhile, here are quick ID rules you can use to decide which of the three it is:

- Nucleus
- Largest organelle, usually a single large spherical/oval structure in the cell center.
- Bounded by a double membrane (nuclear envelope), often shows one or more darker nucleoli and chromatin.
- Under light microscope appears as a large round structure with a darker spot (nucleolus).

- Mitochondrion
- Small, rod- or oval-shaped organelle.
- Bounded by a double membrane; inner membrane folded into cristae (visible at high magnification or EM).
- Often scattered through the cytoplasm, not centrally located like the nucleus.

- Golgi apparatus
- Series of flattened, stacked membrane sacs (cisternae) often with small vesicles at the edges.
- Usually located near the nucleus/ER, looks like a stack of pancakes or curved ribbons.

If you upload the image or tell me whether A is large and central, small and folded inside, or a stack of flattened membranes, I’ll identify it.