21.2. Biotechnology
A subsection of Biology, 0610, through 21. Biotechnology and genetic modification
Listing 10 of 143 questions
Yeast is used in bread-making. It respires anaerobically, producing carbon dioxide. Write the balanced chemical equation for anaerobic respiration of yeast in bread-making. A baker wants to increase the rate of carbon dioxide production in the bread-making process. The baker trialled different concentrations of glucose solution in the bread dough. shows the results. 0.0 0.0 0.5 1.0 1.5 2.0 2.5 rate of carbon dioxide production / cm3 per min 3.0 3.5 4.5 4.0 1.0 2.0 3.0 4.0 concentration of glucose solution / % 5.0 6.0 7.0 Predict the rate of carbon dioxide production if the concentration of the glucose solution was 7.0%. cm3 per min The baker carried out the trials at 30 °C. The trials were repeated at 20 °C. Draw a line on to show the rate of carbon dioxide production at 20 °C. The baker carried out another trial at 80 °C. No carbon dioxide was released. State why no carbon dioxide was produced. Name one other industrial process that uses yeast. During the production of penicillin, large fermenters are used. shows a fermenter. FRROLQJZDWHU VWHULOHDLU QXWULHQWV SUHVVXUH UHOHDVHYDOYH PRWRU SUREHV VDPSOHWXEH FRROLQJZDWHU ZDWHUILOOHG MDFNHW VWLUUHU WDS SURGXFWV Explain the functions of the following parts of the fermenter: stirrer water-filled jacket probes The air and nutrients that are added to the fermenter are sterile. State why they must be sterile.
0610_m16_qp_42
THEORY
2016
Paper 4, Variant 2
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Questions Discovered
143