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BMI2601 exam answers
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- University Of South Africa (Unisa)
BMI2601 (clinical biochemistry) exam and assignment answers
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Group Activity 3 [50]Suggested Answers
Question 1 [15]
Discuss the following terms or phrases
1.1. Photoautotrophs (5)
These organisms use light as their energy source and CO 2 as their carbon source.
Photosynthetic protists and cyanobacteria employ water as the electron donor and
release oxygen. Purple sulphur bacteria and green sulphur bacteria extract electrons
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from inorganic donors such as hydrogen, hydrogen sulphide and elemental sulphur
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because they cannot oxidize water. Photoautotrophs are important primary producers in
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ecosystems
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1.2. Chemoorganotrophs rs e (5)
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These are organisms which use the reduced organic compounds made by autotrophs
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as sources of energy, electrons and carbon. Chemoorganotrophs contribute to
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biogeochemical cycles such as nitrogen cycle and carbon cycle in which elements are
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converted into different forms. Glucose is used as an energy source by many
chemoorganotrophs during aerobic respiration, anaerobic respiration and fermentation.
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When they oxidize an organic source energy source, the electrons released are
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accepted by electron carriers such as NAD+ and FAD.
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1.3. Substrate level phosphorylation (5)
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This is the synthesis of ATP from ADP by phosphorylation coupled with the
exergonic breakdown of a high-energy organic substrate molecule. The direct
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production of ATP during glycolysis and TCA cycle takes place by substrate level
phosphorylation. For example during glycolysis, the conversion of 1, 3
bisphosphoglycerate to 3-phosphoglycerate produces ATP by substrate level
phosphorylation.
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, Question 2 [10]
Study the Tricarboxylic acid cycle below and answer the questions which follow
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rs e
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2.1. Carbon skeletons for amino acid biosynthesis are supplied by intermediates of the
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citric acid cycle. Which intermediate would supply the carbon skeleton for synthesis of
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five-carbon amino acid? (1)
α −¿ ketoglutarate
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2.2. How many reduced dinucleotides would be produced with four turns of the citric
acid cycle? (2)
4 FADH2 and 12 NADH
This study source was downloaded by 100000769268334 from CourseHero.com on 07-13-2021 16:29:04 GMT -05:00
https://www.coursehero.com/file/24312169/SuggestedAnswerstoGroupActivity3docx/
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