Colorimeter Samenvattingen, Aantekeningen en Examens

AQA AS BIOLOGY REVIEW QUESTIONS AND ANSWERS The graph below shows the results of an osmosis experiment investigating the effect of changing the concentration of sodium chloride (NaCl) on mass of potatoes. - ANSWER C - 0.42 mold-3 The reaction between carbon dioxide and water forms carbonic acid. This reaction is catalysed by the enzyme carbonic anhydrase. To catalyse this reaction, carbonic anhydrase needs a cofactor that attaches to its active site as a prosthetic group. What is ...

A guide for Biology practicals at AS- a summary of practical investigations from across the year. This is designed for AS3, but involves content from across the course. Colour coded document. Includes the following: Biochemical Food Tests Chromatography and Rf Values Effect of Temperature, pH, and Enzyme Concentration on Enzyme Action Dilution (Simple and Serial) Using a Colorimeter (including Calibration Curves) The Impact of Temperature on the Permeability of Cell Membranes in Beetroot...

AQA AS Biology Exam Frequent Questions and Answers 2023 The nucleus and a chloroplast of a plant cell both contain DNA. Give three ways in which the DNA in a chloroplast is different from DNA in the nucleus. [3 marks] - ANSWER In chloroplasts -DNA shorter; -Fewer genes; -DNA circular not linear; -Not associated with protein/histones, unlike nuclear DNA; -Introns absent but present in nuclear DNA; Some DNA nucleotides have the organic base thymine, but RNA nucleotides do not ha...

SECTION A You should spend a maximum of 20 minutes on this section. Answer all the questions. 1 Which row shows the atomic structure of 55Mn2+? Protons Neutrons Electrons A 25 30 23 B 25 55 23 C 27 30 25 D 30 25 28 Your answer 2 The Group 2 elements react with water, forming a solution and a gas. Which statement is correct? A The reactivity of the elements decreases down Group 2. B The pH of the solution formed increases down Group 2. C The reaction is a neutralisation. D The equa...

PMT exam questions (2) & answers 2023/2024 1 The cell vacuoles of beetroot (Beta vulgaris) contain the red pigment betalain. A student investigated the effect of temperature on the permeability of beetroot cell membranes. In this investigation, five pieces of beetroot were used. One piece of beetroot was left in 10 cm3 of distilled water for 20 minutes at 20 °C. After 20 minutes, the piece of beetroot was removed and the intensity of the colour of the water was measured using a colorimet...

BTEC APPLIED SCIENCE UNIT 2 AIM A practical scientific procedures and techniques BTEC Assignment Brief Qualification Pearson BTEC Level 3 National Certificate in Applied Science Pearson BTEC Level 3 National Extended Certificate in Applied Science Pearson BTEC Level 3 National Foundation Diploma in Applied Science Pearson BTEC Level 3 National Diploma in Applied Science Pearson BTEC Level 3 National Extended Diploma in Applied Science Unit number and title Unit 2: Practical Scientif...

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 ...

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

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 ...

2024 aqa as biology paper 2 2022 / 2023 AQA AS BIOLOGY 2 Paper 2 Question Paper & Mark scheme 2024 update what is pre mrna - ANSWER-pre mrna only produced in eukaryote cell. splicing only occurs in eukaryote cell. what is pna - ANSWER-pna is complementary to dna,reducing rna polymerase activity. What is tRNA? - ANSWER-provides amino acid joins to trna. What is a isomer? - ANSWER-isomer what term is used to describe the different structures of a glucose and b glucose? [1mark] - ANSWER-hydro...