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2026 Aqa A Level Biology Paper 3 Examprep Material Solved Questions And Verified Solutions Premium Collection

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2026 AQA A LEVEL BIOLOGY PAPER 3 EXAMPREP MATERIAL SOLVED QUESTIONS AND VERIFIED SOLUTIONS PREMIUM COLLECTION

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2026 AQA A LEVEL BIOLOGY PAPER 3
EXAMPREP MATERIAL SOLVED QUESTIONS
AND VERIFIED SOLUTIONS PREMIUM
COLLECTION


◉ When a nerve impulse arrives at a synapse, it causes the release of
neurotransmitter from vesicles in the presynaptic knob. Describe how.
Answer: nerve impulse causes calcium ion channels to open
calcium ions enter by facilitated diffusion
causes synaptic vesicles to fuse with presynaptic membrane


◉ Use your knowledge of how myosin and actin interact to suggest
how the myosin molecule moves the mitochondrion towards the
presynaptic membrane. Answer: myosin head attaches to actin and
performs powerstroke
this pulls mitochondria along the actin
next myosin head attaches to actin and performs powerstroke


◉ This movement of mitochondria happens when nerve impulses
arrive at the synapse. Suggest and explain one advantage of the
movement of mitochondria towards the presynaptic membrane when
nerve impulses arrive at the synapse. Answer: mitochondria supply
ATP
for active transport of ions

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