|Acetylcholine |A neurotransmitter (transmitter substance) found in cholinergic synapses. |
|Acetylcholinesterase |An enzyme in the synaptic cleft that breaks down the transmitter substance acetylcholine. |
|Actin |A protein found in muscle cells. It is the main component of the thin filaments. |
|Action potential |A brief reversal of the resting potential across the cell surface membrane of a neurone. All action |
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|Anabolism |Type of metabolism: biochemical reactions that synthesise large molecules from smaller molecules. This |
| |requires energy/ATP. |
|Antagonistic |Working against each other in a pair. |
|Annealing |The term used to describe hydrogen-bond formation between complementary base pairs when sections of |
| |single-stranded DNA or RNA join together. Annealing is seen when complementary sticky ends join and |
| |where DNA probes attach to a complementary DNA section. |
|Antidiuretic hormone (ADH) |The hormone made in the hypothalamus and released from the pituitary gland that acts on the collecting