Cells and Organelles

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  • Created by: Macaw
  • Created on: 23-01-13 19:29

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

Lysosome:

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.

Centrioles:

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

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