AQA additional science biology revision notes

my biology revision notes for B2, AQA. They have been made from the AQA additional science textbook and i have chemistry and physics notes too. hope they help XD

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  • Created by: natasha
  • Created on: 16-05-12 17:24
Preview of AQA additional science biology revision notes

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B.6 ­ INHERITANCE & VARIATION
BIOLOGY
Light microscopes ­ used in schools to magnify things several hundred times
Electron microscopes ­ used by scientists to magnify more than a hundred thousand times
Mitochondria
Ribosomes
Cytoplasm ­ a liquid gel in
which most of the
chemical reactions
Nucleus-controls all the needed for life to take
activities of the cell. Cell membrane ­ controls
place ­ like respiration
Contains instructions for the passage of substances
making new cells or new in and out of the cell
organisms
Ribosomes ­ where
Mitochondria ­ structures protein synthesis takes
in the cytoplasm when place. All the proteins
oxygen is used and most of needed in the cell are
the energy is released made here
during respiration

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B.6 ­ INHERITANCE & VARIATION
Plants make their own food through photosynthesis and do not move their own bodies about. Plant cells have:
- A CELL WALL MADE OF CELLULOSE ­ strengthens the cell and gives it support
Many (but not all) have:
- CHLOROPLASTS ­ found in all green parts of the plant. They contain the green substance CHLOROPHYLL.…read more

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B.6 ­ INHERITANCE & VARIATION CONE CELL FROM HUMAN EYE
FAT CELL
They are STORAGE CELLS; excess fat is used to
fill up the cell. They help animals to survive
when food is in short supply. 3 main
Are in the LIGHT SENSITIVE LAYER OF THE EYE
adaptations:
(retina). They allow you to see in colour. 3 main
V. Little normal cytoplasm, leaving lots of adaptations:
room for fat storage
Outer segment filled with visual pigment which
V. Few mitochondria, they use v.…read more

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B.6 ­ INHERITANCE & VARIATION
In plants, photosynthetic tissues make food by photosynthesis while storage tissues
store any extra food made by starch
In many bigger living organism, several tissues work together to do particular jobs. They form ORGANS, like the
heart, kidneys of the leaf.…read more

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B.6 ­ INHERITANCE & VARIATION
Rates of diffusion:
If there is a big difference in concentration, diffusion will take place a lot quicker. When a substance is moving from a
higher concentration to a lower concentration, the movement towards the less concentrated one will appear to be
quite low.…read more

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B.6 ­ INHERITANCE & VARIATION
Cell ­ basically some chemicals dissolved inside a partially permeable bag of cell membrane. The cell has a fairly
concentrated solution of salts and sugars.…read more

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B.6 ­ INHERITANCE & VARIATION
PHOTOSYNTHESIS
Plants make their own food through photosynthesis. It takes place in the GREEN PARTS (esp. The leaves) when it's
light
The cells in the leaves of a plant are full of chloroplasts, which contain a green substance called chlorophyll.…read more

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B.6 ­ INHERITANCE & VARIATION
Key points:
Photosynthesis can be summed up by this equation: carbon dioxide + water [+light energy]-> glucose +
oxygen
During photosynthesis light energy is absorbed by the chlorophyll in the chloroplast. It is used to convert
carbon dioxide and water into sugar (glucose).…read more

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B.6 ­ INHERITANCE & VARIATION
HOW PLANTS USE GLUCOSE
Some of the glucose produced is immediately used by the cells. They use it for respiration and to provide energy for
cell functions, growth and reproduction.
RESPIRATION:
Plant cells respire all the time. They break down glucose using oxygen to provide energy for the cells. CO2 and water
are waste products. The energy released is then used to build up smaller molecules into bigger molecules. Some of
the glucose is converted into starch for storage.…read more

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B.6 ­ INHERITANCE & VARIATION
cytoplasm and the membranes. Glucose and starch are made up of carbon, hydrogen and oxygen. Proteins are made
up of amino acids which contain carbon, hydrogen, oxygen and nitrogen. Plants need NITRATES from the soil to
make proteins. The nitrates are dissolved in water and are taken up through the roots from the soil.…read more

Comments

Conor Murphy

Will you be able to post Additional Science Chemistry AQA Notes? Your resources are very helpful!

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