• Revision:Eukaryotic Cells

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Draw a diagram to show the ultrastructure of a generalised animal cell as seen in a electron micrograph

File:General eukaryote.jpg

State one function of each of these organelles: ribosomes, rough endoplasmic reticulum (rER), lysosomes, Golgi apparatus, mitochondrion and nucleus

Ribosomes: Main site for protein synthesis.

Rough endoplasmic reticulum: Is the part of the ER which is decorated/studded with ribosomes. The proteins that are made goes in to the ER and then are sent out in the cell.

Lysosomes: Uses hydrolytic enzymes to produce macromolecules.

Golgi apparatus: Modifies the products received from the rER and then are transported to parts of the membrane.

Mitochondrion: the site for cellular respiration.

Nucleus: Contains the inherited information and controls the function and genotype of the cell.

Compare prokaryotic and eukaryotic cells

  • Both have cell membranes and carry out the functions of the cell such as metabolic reactions, respiration etc.
  • Prokaryotic have no nucleus which eukaryotic have.
  • Eukaryotic have ER and mitochondrion. Prokaryotic does not.
  • Eukaryotic cells have 70s ribosomes and prokaryotic cells have 80s ribosomes.
  • Eukaryotic cells have DNA in the nucleus whereas prokaryotic cells have circular naked DNA in the cytoplasm.

Describe three differences between plant and animal cells

Plant cells has a cell wall, chloroplast and vacoule whereas an animal cell does not.

State the composition and function of the plant cell

The plant cell wall contain cellulose microfibrils which help the cell to maintain its shape.


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