A eukaryotic cell always contains:
- a nucleus (with genetic material)
- surrounded by double membrane made up of phospholipids (nuclear envelope)
- Organelles (structures) in the cytoplasm each surrounded by 1-2 membranes
Ultrastructure: the fine structure that can be observed through the magnification of an electron microscope
Nucleus: double-layered organelle (nuclear envelope) with (nuclear) pores.
- Contains chromatin: mass of genetic material (DNA + RNA) used to condense DNA into chromosomes during eukaryotic cell division
- Contains nucleolus: used in making ribosomes
- Pores allow substances (e.g. RNA) to move between the nucleus and cytoplasm
Single-membrane organelle (structure) that has no clear internal structure
- Contains digestive enzymes to break down worn-out components of the cell, and to digest invading invading cells.
2 hollow cylinders that contain a ring of microtubules.
- Arranged at right-angles to each other
- Microtubles are tiny protein cylinders
- Involved in the separation of chromosomes during cell division…