Eukaryotic Cells

Eukaryotic cells contain a nucleus. Simpler cells such as bacteria have no nucleus. All eukaryotic cells have specialised features in order to carry out specific functions.
You can see the ultrastructure or fine detail of the cell organelles under an electron microscope.

Leucocyte
There are several types of leucocyte in the blood.

Organelles:

Organelle

Nucleus

Key Structure

• Contains DNA packed as chromosomes.
• Surrounded by nuclear envelope ( a double membrane) containing pores.

Function

• Carried genetic information
• Genes on the DNA code for proteins
• Controls the activities of the cell.

Organelle

Nucleolus

Key Structure

Dark stained area in nucleus

Function

Production of RNA and ribosomes

Organelle

Ribosome

Key Structure

Tiny organelle attached to endoplasmic reticulum or free in cytoplasm.

Function

• Site of protein synthesis
• Assembles amino acids into proteins

Organelle

Rough endoplasmic reticulum (RER)

Key Structure

• Flattened membrane system within cytoplasm
• Has ribosomes attached to surface

Function

• Site of attachment for ribosomes
• Transports proteins to golgi apparatus, by forming vessicles.

Organelle

Smooth ER

Key Structure

Membrane system without ribosomes attached

Function

Produces and transports triglycerides, phospholipids and cholesterol.

Organelle

Golgi Apparatus

Key Structure

A stack of flat membrane bound sacs

Function

Processes proteins by modifying…