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AQA A Level Biology Paper 3 – AQA – 2025 – Practice Questions with Reviewed Answers

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This document contains a full set of mock questions for AQA A Level Biology Paper 3, covering synoptic content across multiple topics including genetics, ecology, physiology, and practical techniques. It includes clearly structured, reviewed answers designed to reflect AQA mark schemes and help students understand how to achieve full marks.

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AQA A Level Biology Mock Paper
3 questions and reviewed
answers
When a nerve impulse arrives at a synapse, it causes the release of neurotransmitter from vesicles in the
presynaptic knob. Describe how - CORRECT ANSWERS-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 - CORRECT ANSWERS-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 - CORRECT ANSWERS-mitochondria supply ATP

for active transport of ions



Give two examples of biological molecules containing nitrogen that would be removed when a crop is
harvested - CORRECT ANSWERS-DNA

proteins



Outline a method ecologists could use to determine plant species richness at one site - CORRECT
ANSWERS-grid with coordinates selected using random number generator

use of quadrat

identify plant species in each quadrat

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