AQA B2 - Cells

Here is everything you need to know about cells for AQA Biology 2, new specification 2012.

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  • Created by: Sara
  • Created on: 05-12-12 09:08
Preview of AQA B2 - Cells

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Cells
There are four main types of cell that you need to know for this course.
Animal cells -
Nucleus ­ contains genetic information which controls the activities of the cell
Cell membrane ­ holds the cell together whilst controlling what goes in and out
Cytoplasm ­ a gel-like substance where the chemical reactions occur. This contains enzymes which
control the reactions
Ribosomes ­ This is where the proteins are made
Mitochondrion ­ This is where respiration takes place; releasing energy for the cell
Plant cells ­ (they contain all of the organelles above, as well as the organelles listed below)
Cell wall ­ made of cellulose; strengthens and supports the cell
Vacuole- contains cell sap; a weak solution of sugar and salts
Chloroplasts ­ the organelle needed for photosynthesis to take place
Yeast cells-
Cell wall ­ strengthens and supports the cell
Cytoplasm ­ where the chemical reactions take place
Cell membrane ­ controls what goes in and out of the cell while holding the cell together
Nucleus ­ contains genetic information which controls the activities of the cell
Bacterial cells- they contain the same organelles as a yeast cell. However, they do not have a nucleus.
They have a loop of DNA in the cytoplasm, without a nucleus.

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