AQA A Level Biology
Biology
These are flashcards made for AQA A-level biology, using the textbook and my notes. They cover the content of the entire course, except for the required practicals. Hope these help!
Updated 12/05/24: Corrected a mistake - DNA polymerase is complementary to 3' end (not 5').
Please update "During replication, the two DNA strands separate and each acts as a template for the production of a new strand. As new DNA strands are produced, nucleotides can only be added in the 5’ to 3’ direction. Explain why new nucleotides can only be added in a 5’ to 3’ direction. (4)" card if downloaded before 12/05/24
Sample Data
| Front | Describe transmission across a cholingeric synapse. |
| Back | Incoming AP causes depolarisation in pre-synaptic knob causing Ca2+ channels to open → calcium ions diffuse into pre-synaptic neuroneInflux of Ca2+ causes vesicles containing neurotransmitter / acetylcholine to fuse to pre-synaptic membraneacetylcholine is released into synaptic cleft (exocytosis) Neurotransmitters diffuse across synaptic cleft and bind to specific neurotransmitter receptors on Na+ channels on post-synaptic membraneNa+ channels open Na+ diffuse into post-synaptic knobif threshold is reached depolarisation initiates action potentialAcetylcholinesterase (AChE) hydrolyses acetylcholine into acetic acid and cholinecausing Na+ channels to close (as neurotransmitter is absent)Products are reabsorbed by the presynaptic neurone and ATP is used to remake acetylcholinemore acetylcholine can be made at the SERacetylcholine is stored in synaptic vesicles for future use |
| Front | Biomass is measured in terms of |
| Back | mass of carbonor dry mass of tissue per given area |
| Front | Draw the stucture of beta glucose. |
| Back |
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