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Page 2 of 25 Q2. tRNA is a single stranded molecule with a binding site at one end thus it can only carry one type of amino acid, and a triplet of bases (anti- substrate level phosphorylation. • Student B held a ruler vertically between student A’s thumb and first finger, with the ruler at 0 mm lightly touching student A’s first finger. 4. Unlock Your Potential in Maths and Sciences with a Cambridge & Durham Graduate the level, ie if the response is predominantly level 3 with a small amount of level 4 material it would be placed in level 3 but be awarded a mark near the top of the level because of the level 4 content. 4 Populations in Ecosystems - AQA Biology A-level Author: PMT Education Created Date: 20200121153204Z AQA Biology A-Level Required Practical 3 Production of a dilution series of a solute to produce a calibration curve with which to identify the water potential of plant tissue. 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Kayleigh H. ly/pmt-edu This work by PMT Education is licensed under CC BY-NC-ND 4. The genetic constitution of an organism. However, registered schools/colleges for AQA are permitted to copy material from this booklet for their own internal use, with the following important exception: AQA cannot give permission to schools/colleges to photocopy any MARK SCHEME – A-LEVEL BIOLOGY – 7402/1 – JUNE 2018 3. 2 Carbohydrates - AQA Biology A-level Author: PMT Education Created Date: 20200121153039Z AQA Biology A-level Topic 1: Biological Molecules Notes www. University of Birmingham - MBChB Medicine. 1 - Inheritance Flashcards https:bit. lypm t-cc https:bit. 3 - Digestion and absorption Flashcards httpsbit. Figure 5. Step 2 Determine a mark Once you have assigned a level you need to decide on the mark. 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