GCE A Level Biology Unit 5 notes for AQA

GCE A Level Biology notes written for the AQA specification Biology (2410).

The topics covered in the revision guide are detailed here:

Unit 5

3.5.1 Stimuli, both internal and external, are detected and lead to a response.
3.5.2 Coordination may be chemical or electrical in nature.
3.5.3 Skeletal muscles are stimulated to contract by nerves and act as effectors.
3.5.4 Homeostasis is the maintenance of a constant internal environment.
3.5.5 Negative feedback helps maintain an optimal internal state in the context of a dynamic equilibrium. Positive feedback also occurs.
3.5.6 The sequence of bases in DNA determines the structure of proteins, including enzymes.
3.5.7 Gene expression is controlled by a number of features.
3.5.8 Gene cloning technologies allow study and alteration of gene function in order to better understand organism function and to design new industrial and medical processes.