What is a catalyst?

A substance which increases the rate of a reaction without being consumed

Related Biology GCSE answers

All answers ▸

What are the different ways in which substances can move across cell membranes?


How does the development of antibiotic resistance in bacteria provide evidence for evolution?


Neurons do not make direct contact but are separated by synapses. Impulses cross a synapse by means of a neurotransmitter. Describe the process of neurotransmitter release at a synapse. You may use a labelled diagram.


Which of the basic life processes is described here? The ability of multicellular organisms to regulate their internal environment so that it stays optimum for cellular survival.