Q1. not - Kingsmead School, Hednesford- biological washing powders enzymes biology igcse notes ,2020-2-13 · There are enzymes in biological washing powders. Biological washing powder has to be used at temperatures below 45 °C. (a) The enzymes in biological washing powders do not work on the stains on clothes at temperatures above 45 °C. Explain why.Q1. not - Kingsmead School, Hednesford2020-2-13 · There are enzymes in biological washing powders. Biological washing powder has to be used at temperatures below 45 °C. (a) The enzymes in biological washing powders do not work on the stains on clothes at temperatures above 45 °C. Explain why.
Disadvantage 1. If people misuse washing powders they may have allergic reactions on their skin. The enzymes are enclosed in capsules in the dry powder. Once the powder is dissolved, hands should not be placed in the water. 5 of 8.
Penicillium. a fungus used as a source of a chemical used to make penicillin. Penicillin production. 1. Penicillium mould naturally produces the antibiotic penicillin. 2. Scientists learned to grow Penicillium mould in deep fermentation tanks by adding a kind of sugar and other ingredients.
A substance that speeds up a chemical reaction and is not changed by the reaction. Term. Explain how enzymes work using the "lock and Key" method. Definition. [image] Term. Denatured Enzyme. Definition. An enzyme which has been inactivated either by a too high or low pH or a too high or low temperature.
2020-10-27 · Biological washing powders contain enzymes that break down food stains. (a) Complete Table 2.1 by naming the enzymes that break down three substances in food stains and by stating the product or products. Table 2.1. substance enzyme product(s) starch fat protein [3] Some students compared how effective biological and non-biological washing ...
2 天前 · 1 A suitable dilution of detergent is around 5%, that is 5 cm 3 of detergent per 100 cm 3.This is calculated from the typical detergent pack suggestion of 100 cm 3 of detergent in a medium soil wash and machines using around 20 litres of water for the wash cycle.. 2 Provide portions of enzymes to add to known volumes of the detergent, or make up solutions of …
2021-3-19 · enzyme activity / arbitrary units Fig. 3.1 Using the information in Fig. 3.1, describe the effect of increasing temperature on the activity of the enzyme. [3] Enzymes extracted from bacteria are used in biological washing powders. (b) Describe how bacteria are used to produce enzymes for biological washing powders. [4]
2020-1-22 · (b) Enzymes are used in biological washing powders. (i) Describe how the presence of these enzymes may increase the efficiency of the washing powder in removing stains from clothes. [3] (ii) Explain why the temperature of the wash needs to be carefully controlled. [3] (iii) Suggest a suitable temperature for a wash using a biological washing ...
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2020-10-14 · (b) Enzymes are used in biological washing powders. (i) Describe how the presence of these enzymes may increase the efficiency of the washing powder in removing stains from clothes. [3] (ii) Explain why the temperature of the wash needs to be carefully controlled. [3] (iii) Suggest a suitable temperature for a wash using a biological washing ...
2020-10-27 · Biological washing powders contain enzymes that break down food stains. (a) Complete Table 2.1 by naming the enzymes that break down three substances in food stains and by stating the product or products. Table 2.1. substance enzyme product(s) starch fat protein [3] Some students compared how effective biological and non-biological washing ...
Overview Content and How Science Works overview In Unit B3 students study three topics that give them the opportunity to explore some areas of biology in more depth. The aim is to engender an interest in biology that makes them want to pursue the subject further or simply enjoy finding out more about themselves, other organisms and the applications of biology in the world in
2020-1-22 · 7 The development of biological washing powders using enzymes from bacteria is an example of biotechnology. (a) State two reasons why bacteria are useful in biotechnology, such as in the development of biological washing powders.
2021-6-14 · GCSE. Biology - (Higher) G. rade. Materials. For this paper you must have: Ruler. Pencil. ... Enzyme technology The diagram shows how the human insulin gene can be used to genetically modify bacteria. (a) (i) Name the enzyme used to join the insulin gene to the plasmid. ... Washing powders can be biological or non-biological.
2019-9-9 · Enzymes and Digestion FACTFILE: GCSE BIOLOGY: UNIT 1.4 Energy kJ Course of chemical reaction Activation Energy Reaction pathway in the presence of a catalyst Products Reactants Learning Outcomes 1.4.1 describe the actions of enzymes as proteins that are biological catalysts which speed up the rate of reactions without being used up, to include
Enzymes in washing powders People have been experimenting with ways to use the power of enzymes to clean clothing for a long time; in fact, the first patent was in 1913. Because stains are made of different types of molecules, a range of enzymes are needed to break them down.
2021-3-19 · Enzymes Question Paper 4 . Subject Biology . Topic Enzymes . Booklet Question Paper 4 . Time Allowed: 68 minutes Score: /56 Percentage: /100 Exam Board CIE Level IGCSE Paper Type (Extended) Theory Paper . 1 (a) Define the term enzyme. [2] (b) Enzymes are used in biological washing powders. (i) Describe how the presence of these ...
2018-5-21 · Cambridge IGCSE Biology – past paper questions and answers. ALTERNATIVE TO PRACTICAL questions . Alternative to Practical 1 . An experiment was carried out to investigate the effect of different concentrations of sucrose solution on the length of potato strips. Five test-tubes were set up, each containing a different concentration of sucrose ...
Enzymes in washing powders People have been experimenting with ways to use the power of enzymes to clean clothing for a long time; in fact, the first patent was in 1913. Because stains are made of different types of molecules, a range of …
2019-1-1 · IGCSE Biology Biotechnology is the application of biological organisms, ... 2. Biological washing powders may cause allergy in some people. Proteases: ... Ligase enzymes Bacteria have circular pieces of DNA called plasmids. The plasmids often carry special genes such resistance to antibiotics for bacteria. Restriction enzymes are produced by ...
2019-7-20 · 5. In terms shape, explain why a specific enzyme is needed for a specific substrate 6. State why enzymes are useful in soap powders for washing clothes. 7. State the name of the enzymes present in biological washing powders that break down the following food materials: Food molecule Type of enzyme Protein Starch Lipids
2020-10-14 · (b) Enzymes are used in biological washing powders. (i) Describe how the presence of these enzymes may increase the efficiency of the washing powder in removing stains from clothes. [3] (ii) Explain why the temperature of the wash needs to be carefully controlled. [3] (iii) Suggest a suitable temperature for a wash using a biological washing ...
2019-1-1 · IGCSE Biology Biotechnology is the application of biological organisms, ... 2. Biological washing powders may cause allergy in some people. Proteases: ... Ligase enzymes Bacteria have circular pieces of DNA called plasmids. The plasmids often carry special genes such resistance to antibiotics for bacteria. Restriction enzymes are produced by ...
2018-3-2 · Enzymes and Washing Powders. Subject: Biology. Age range: 14-16. ... (no rating) 0 reviews. Ejt80's Shop. Science teacher with over 10 years experience, specialising in biology and chemistry. Resources cover a range of age groups and abilities. As I develop more resources they will be uploaded. ... Application questions on the use of enzymes in ...
2021-4-12 · Enzymes everywhere! Enzymes control all kinds of reactions in all cells. For example, they help control; respiration, photosynthesis, and our digestion, amongst many others. Protease and lipase enzymes are used in biological washing powders to remove those stubborn stains. Enzymes are also used in making foods and drinks.