AQA AS BIOLOGY FULL NOTES

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AS Biology Unit 1 page 1

AQA AS Biology Unit 1 Contents Specification 2 Biological Molecules Chemical bonds 4
Carbohydrates 6 Lipids 8 Proteins 10 Biochemical Tests 16 Enzymes 17 Cells Eukaryotic
Cells 24 Prokaryotic Cells 28 Cell Fractionation 30 Microscopy 31 The Cell Membrane 35
Movement across Cell Membranes…

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AS Biology Unit 1 page 2


Biology Unit 1 Specification
Biochemistry Biological Molecules Biological molecules such as carbohydrates and proteins are often
polymers and are based on a small number of chemical elements.
· Proteins have a variety of functions within all living organisms. The general structure of an amino…

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concentration gradient.
Physiology Exchange Diffusion is the passive movement of substances down a concentration gradient.
Surface area, difference in concentration and the thickness of the exchange surface affect the rate of
diffusion.
Gas Exchange System The gross structure of the human gas exchange system limited to the alveoli,
bronchioles, bronchi,…

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AS Biology Unit 1 page 3
Heart Heart structure and function. The gross structure of the human heart and its associated blood vessels
in relation to function. Myogenic stimulation of the heart and transmission of a subsequent wave of electrical
activity. Roles of the sinoatrial node (SAN), atrioventricular node (AVN)…

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