AQA Biology B2 Revision

Revsision cards just covering everything thats needed in the specification. All key points included.

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  • Created by: hiss
  • Created on: 21-11-09 10:31

ANIMAL & PLANT CELLS

Most ANIMAL CELLS contain a NUCLEUS, CYTOPLASM, CELL MAEMBRANE, MITOCHONDRIA and RIBOSOMES.

PLANT CELLS contain ALL THE ABOVE as well as a CELL WALL and in MANY CASES, CHLOROPLASTS and a PERMANENT VACUOLE filled with SAP.

ENZYMES CONTROL the CHEMICAL REACTIONS INSIDE CELLS.

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SPECIALISED CELLS

CELLS MAY BE SPECIALISED to carry out a PARTICULAR FUNCTION.

Examples of specialised cells are FAT CELLS, CONE CELLS, ROOT HAIR CELLS AND SPERM CELLS.

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HOW DO SUBSTANCES GET IN AND OUT OF CELLS?

DISSOLVED SUNSTANCES move IN AND OUT OF CELLS by DIFFUSION, OSMOSIS and ACTIVE TRANSPORT.

DIFFUSION is the NET MOVEMENT of PARTICLES from an area where they are at a HIGH CONCENTRATION to an area where they are at a LOW CONCENTRATION.

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OSMOSIS

OSMOSIS is a SPECIAL CASE OF DIFFUSION.

Osmosis is the DIFFUSION OF WATER from a HIGH WATER CONCENTRATION (DILUTE SOLUTION) to a LOW WATER CONCENTRATION (CONCENTRATED SOLUTION) through a PARTIALLY PERMEABLE MAEMBRANE that allows the PASSAGE OF WATER MOLECULES.

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PHOTOSYNTHESIS

PHOTOSYNTHESIS can be summed up by the equation;

CARBON DIOXIDE (CO2) + WATER (H2O) [+ light energy] = GLUCOSE (C6H12O6) + OXYGEN (O2).

During photosynthesis, LIGHT ENERGY is ABSORBED by the CHLOROPHYLL in the CHLOROPLASTS. It is used to CONVERT CO2 AND WATER into GLUCOSE. Oxygen is released as a by product

Leaves are WELL ADAPTED to allow the MAXIMUM PHOTOSYNTHESIS to take place.

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Comments

Rabi

thats not all of b2 though is it?

John

No its not ...

rhfghdf

Helpful but as previously said maybe a little bit more detail or information is needed.

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