AQA A Level Biology - Paper 3 (synoptic) Comprehensive Practice Test | Study Guide Exam Questions & Verified Answers | Latest Update 2026 | 2027 (Rated Grade A) Quiz_________________? 1) Active immunity requires exposure to antigen where as pass

AQA A Level Biology - Paper 3 (synoptic) Comprehensive Practice Test | Study Guide Exam Questions & Verified Answers | Latest Update 2026 | 2027 (Rated Grade A) Quiz_________________? 1) Active immunity requires exposure to antigen where as passive immunity doesn't require exposure to antigen. 2) Active takes time for protection to develop where as passive protection is immediate. 3) Active immunity produces memory cells where as passive doesn't 4) Active protection is long term as antibodies are produced after activation of memory cells in response to complementary antigen present cell being present in body where as passive protection is short term as antibodies given are broken down and not produced again by memory cells. - Answer Name 4 differences between passive and active immunity Quiz_________________? 1) control transport of substances in an out of the cell as the membrane is partially permeable 2) acts as a receptor site 3) separates cell and organelles from each other - Answer 3 functions of a cell membrane Quiz_________________? 1) It is non specific - doesn't tell which reducing sugar is present , a biosensor can be used to detect for specific sugars 2) It's qualitative so colour change is being measured so can't obtain concentration of reducing sugar but allows an estimate for how much is present in the strength of the colour 3) Is subjective - Answer Issues with the Benedict's test ? Quiz_________________? 1) Water is a metabolite - in many metabolic reactions including condensation and hydrolysis 2) Water is a solvent - medium in which enzyme catalysed reactions take place (metabolic reactions ) and readily dissolves substances like inorganic ions ( as water is dipolar so totally surrounds the ions) , excretory products (urea/ammonia) , respiratory gases and small hydrophilic molecules ( amino acids , etc) 3) Water has a high latent heat of vaporisation (lots of energy required to break hydrogen bonds between water molecules so a lot of energy is used up when water evaporates ) so helps with temperature control as evaporation of sweat cools humans down 4) Water has a high specific heat capacity ( to separate the many hydrogen bonds requires a lot of energy) so acts as a buffer and resists temperature changes to maintain a constant internal body temperature 5) Water has large cohesive forces ( as hydrogen bonds stic - Answer What are the useful properties of water and why ? Quiz_________________? 20 amino acids that differ by a different variable group. - Answer How many amino acids are there that are shared in all organisms ? Quiz_________________? 46 (23 pairs) diploid 23 haploid - Answer What's the diploid and haploid number of chromosomes in humans ? Quiz_________________? 5-10% efficiency as herbivores waste a lot of energy in faeces as high proportion of food cannot be digested. Carnivores can absorb more food than herbivores as they are efficient at digesting protein and may achieve up to 20% efficiency. Efficiency is lower to older organisms. Endothermic such as mammals and birds have a lower efficiency as they use more energy to maintain constant internal body temperature as lose a lot of energy through heat. - Answer Energy transfer efficiency in consumers Quiz_________________? 6CO2 + 6H2O -- light energy -- C6H12O6 + 6O2 - Answer Photosynthesis equation Quiz_________________? A cellular and non living and are just genetic material (DNA or RNA) surrounded by proteins. They are smaller than bacteria and has a capsid which is a protein coat and attachment proteins which allow the virus to attach to a host cell ( complementary receptors on host cell membranes ) and replicate - Answer Viruses Quiz_________________? A detectable change in the internal or external environment of an organism, that produces a response. In plants light, gravity and water are examples. In animals light , sound , chemicals and pressure. - Answer What is a stimulus ? Quiz_________________? A different form of a gene - Answer What is an allele ? Quiz_________________? A group of organisms with similar characteristics that can interbreed to produce a fertile offspring. - Answer Species Quiz_________________? A kineses is a non directional response to a stimulus. The rate of movement or rate of change of direction is related to intensity of the stimulus and kineses results in random movement patterns. In dry air woodlice move faster and turn less often to increase their chance of moving away from drier air. This increases their chance of survival as it reduces water loss as humid air has higher water potential so less water lost by diffusion and keeps them concealed. As the air becomes more humid they move slower and turn more often so they are more likely to stay in that area. - Answer Kinesis in simple organisms Quiz_________________? A measuring tape is stretched across the habitat and plants touching the line at regular intervals are identified and recorded. This is quick and provides non-quantitative data. - Answer Line transect