Search for notes by fellow students, in your own course and all over the country.
Browse our notes for titles which look like what you need, you can preview any of the notes via a sample of the contents. After you're happy these are the notes you're after simply pop them into your shopping cart.
My Basket
Coral Reefs£1.50
Pentose Phosphate Pathway£1.75
Cellular Respiration £3.74
Total£6.99
Or: Edit My Basket
Title: Biology of grade 9
Description: My notes are very short and important for grade 9
Description: My notes are very short and important for grade 9
Document Preview
Extracts from the notes are below, to see the PDF you'll receive please use the links above
The cell membrane
The cell membrane forms a barrier
between the cytoplasm inside the
cell and the environment outside
the cell
...
2-It allows only certain substances
to pass through, while keeping
others in or out
...
The ability to allow only certain
molecules in or out of the cell
...
The structure of phospholipid
bilayer:
Each phospholipid molecule has a
head and two tails
...
It points outwards, toward either
the cytoplasm or the fluid that
surrounds the cell
...
The water-hating tails are on the
interior of the membrane
...
Small lipids and steroids are
hydrophobic and can readily cross
the membrane
...
Hydrophilic molecules such as
glucose and ions like Na+ and K+
need the help of special proteins to
cross the membrane
Title: Biology of grade 9
Description: My notes are very short and important for grade 9
Description: My notes are very short and important for grade 9