Biology b1 notes for aqa

Most chemical reactions in the cell take place in the cytoplasm Plant cells Plants are also multicellular organisms — but they behave in very different ways. Cells need sunlight to do photosynthesis.

Most human and animal cells have: Instead the leaves and shoots can be supported by the pressure of water in their cells.


The middle section is full of mitochondria, which transfer the energy needed for the tail to work. It separates the cell from its environment and allows materials to enter and leave the cell.

GCSE AQA Biology Cell Structure and Transport Questions B1 Third Edition

It is the site for aerobic respiration and releases energy for the cell to use. Plants cannot photosynthesise if it gets too hot.

Suggest why the nucleus and the mitochondria are so important in all cells. Negative feedback systems provide a way of maintaining a condition — a change is registered by receptors and effectors are stimulated to restore the equilibrium.

Each condition has a norm value that the mechanism maintains.

1) Photosynthesis

Is MRSA a bacterium or a virus. The tough wall gives added stability and protection to the plant cell. This genetic material needed to regulate cell function and encodes the information which is passed onto progeny.

The tail moves the sperm to the egg.

My Revision Notes: AQA GCSE (9-1) Biology

The single-celled organism called Amoeba has a special vacuole in its cell. This occurs when a new cell buds out from an existing cell, resulting in two new cells when they split in half.

They contain lots of mitochondria to provide energy needed to make the transmitter chemicals. Two types of nerves of the autonomic system then carry impulses to the heart, controlling its rate: Who was the first person to discover penicillin.

They are also shaped like biconcave discs to increase their surface area for more diffusion of oxygen.

AQA B1 Revision Notes

When describing the movement of molecules down the concentration gradient it is important to understand that when talking about diffusion, the net movement is always down the concentration gradient — not up the gradient.

Hello Everyone, This is a detailed summary notes on Aqa Biology Unit 1.

AQA GCSE Biology B1 2010?

It includes all the topics from the new specification. Topics Include: B Keeping Healthy. Jun 09,  · Update: I think the answer for the plant question was a 'Quadrant' which is a metal square. Also I think the two hormones were FSH (Follicle Stimulating Hormone) to stimulate the maturing of an egg in the ovaries, and LH (Lutenising Hormone) To stimulate the release of a mature Resolved.

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Biology b1 notes for aqa
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AQA Biology 1 - Student Workbook