Colorimeter - Study guides, Revision notes & Summaries

AQA AS BIOLOGY 7401/2 PAPER 2 QUESTION PAPER AND FINAL MARKSHEME JUNE 2022 {MERGED}. Answer all questions in the spaces provided. box 0 1 . 1 What is a gene? [1 mark] 0 1 . 2 Describe how the production of messenger RNA (mRNA) in a eukaryote cell is different from the production of mRNA in a prokaryote cell. [2 marks] 0 1 . 3 Scientists produced a short, single-stranded, artificial nucleic acid, called PNA. The PNA binds to a small section of DNA. The scientists introduced PNA into cell...

BTEC Level 3 Applied Science Unit 2- Practical Scientific Procedures and Techniques Learning Aim A: Undertake colorimetry to determine the concentration of solutions Distinction level

1. Iodide ions are oxidised to iodine by hydrogen peroxide in acidic conditions. H2O2(aq) + 2H+(aq) + 2I-(aq) → I2(aq) + 2H2O(l) The rate equation for this reaction can be written as rate = k [H2O2]a [I-]b [H+]c In an experiment to determine the order with respect to H+(aq), a reaction mixture is made containing H+(aq) with a concentration of 0.500 mol dm-3 A large excess of both H2O2 and I- is used in this reaction mixture so that the rate equation can be simplified to rate = k1 [H+...

what term is used to describe the different structures of a glucose and b glucose? [1mark] - CORRECT ANSWERS-hydroxyl group describe how the result from the colorimeter can identify the fruit juice containing the higher sugar content [1 mark] - CORRECT ANSWERS-juice b suggest how pna affected the transcription of the section of dna [2 marks] - CORRECT ANSWERS-tight binding to mrna due to the strand displacement in a dna target describe how the production of messenger rna (mr

AQA A-Level BIOLOGY 7402/2 Paper 2 Mark scheme June 2022. 1. Organic 2. Respiration 3. Carbon 4. Calorimetry;; 2 (2 x AO1) 4 correct = 2 marks 2–3 correct = 1 mark 0–1correct = 0 marks 2. Ignore aerobic/anaerobic. 3. Accept cells/tissue(s)/plant(s)/animal(s)/organism(s)/ NPP/ living material/biological molecules. 3. Ignore biomass/biological materials/organic matter and reference to ‘dry’. 4. Accept calorimeter but reject colorimeter. 4. Accept phonetic spellings. Ques...

AQA A-Level BIOLOGY 7402/2 Paper 2 Mark scheme June 2022. MARK SCHEME – A-LEVEL BIOLOGY – 7402/2 – JUNE 2022. Organic 2. Respiration 3. Carbon 4. Calorimetry;; 2 (2 x AO1) 4 correct = 2 marks 2–3 correct = 1 mark 0–1correct = 0 marks 2. Ignore aerobic/anaerobic. 3. Accept cells/tissue(s)/plant(s)/animal(s)/organism(s)/ NPP/ living material/biological molecules. 3. Ignore biomass/biological materials/organic matter and reference to ‘dry’. 4. Accept calorimeter but ...

Explain how to work out the rate of reaction for time to produce 10cm3 of gas at different concentrations in arbitrary units when the fastest rate of reaction is 1 arbitrary unit (time taken for each concentration/fastest time)=x 1/x = rate of reaction what things must you remember to include when drawing a graph label the axis with words and units units need to be in brackets points plotted correctly line of best fit rate of reaction graphs will have a curved line of best fit give a ...

1. Investigate the effect of caffeine on heart rate of Daphnia - Topic 1 - Answer Daphnia of same species Placed on microscopic tray in pond water in bits of cotton and allowed to acclimatise for 5 minutes Then BPM counted using tally marks of a sheet of paper for 15 seconds, x4 to give BPM repeated with unknown conc. of caffeine (blind) 0.0% and distilled water, 0.1% and 0.5% Repeat with each daphnia and with other daphnia calculate mean 2. Investigate the vitamin C content of food ...

A Level Edexcel Biology B Core Practicals Exam Questions With Complete Solutions How do you investigate the effect of sucrose concentration on the growth of pollen tubes? 1. Make up solutions of sucrose between 0.2-2 moldm-3 2. Collect a petri dish for each sucrose concentration and place a moistened filter paper on each 3. Collect one microscope slide per concentration 4. Place a few drops of sucrose plus mineral salt medium in the dip of each slide 5. Gently rub the point of a mounted ...

5.2 (determining glucose concentration) Questions and Answers 100% Correct **Aim ** To ascertain the concentration of glucose in an unknown solution. **Methods ** 1. Take 10cm3 of 1% glucose solution into a 50cm3 beaker. 2. Dilute with distilled water to create 1.00%, 0.50%, 0.25%, 0.13%, and 0.06% concentrations in labeled test tubes. 3. Label 7 boiling tubes with these concentrations and one for the unknown. 4. Add 1cm3 of each glucose solution to its corresponding tube, using...