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Cells, tissues and organs
Animal and Plant cells both have:
A Nucleus- to control the activities of the cell (contains genetic material)
Cytoplasm- where many chemical reactions take place
A Cell Membrane- controls what goes in and out of the cell
Mitochondria- where energy is released from respiration
Ribosomes- where…

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Bacteria and Yeast Cells:

Bacteria Yeast

Very small- can only be seen with a Single celled organism
powerful microscope

Have a cell membrane and wall- surround Have a cell membrane and cell wall and
cytoplasm cytoplasm

No nucleus- contain loose genetic Have a nucleus

Multiply to form colonies- these…

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Specialised Cells:

Cell Function Adaption

Absorbs light- Full of chloroplasts- absorb
photosynthesis light energy for
Closely packed cells- form a
layer for efficient absorption
of sunlight
Leaf cell

Absorbs water Long 'finger-like' process
and mineral ions with very thin wall- large
from the soil surface area for absorption


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If you don't know the cell in the exam:

If a cell has many mitochondria- needs a lot of energy e.g muscle cell or
sperm cell
If a cell has many ribosomes it is making a lot of protein e.g gland cells that
produce enzymes
If a cell has a…

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Diffusion: the spreading out of particles in a gas or substance in a
Molecules in gases and liquids move because they have energy.
The net movement depends on the concentration of cells on either side of
the cell membrane.
There will be a net movement from an area of…

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Tissues and Organs:

Tissues: a group of cells with a similar function/structure

When multicellular organisms develop their cells differentiate so that
different cells have different functions.

Some animal tissues are:

Muscle tissue- can contract to cause movement
Glandular tissue- produces substances e.g enzymes
Epithelial tissue- covers parts of the body…

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Groups of organs form organ systems to perform a particular function e.g
the digestive system has several organs including the small intestine.

Organ Systems:
The food you eat must change from insoluble to soluble molecules in order for it
to be absorbed into the blood. This is what the digestive…

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This is so useful, thank you loads and loads

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