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1) The percentage of thymine in the DNA of an organism is approximately 30%. What is the percentage of guanine? a) 70% b) 30% c) 40% d) 20% 2) What is the source of the oxygen released into the air as a product of photosynthesis? a) Chlorophyll b) Carbon dioxide only c) Water only d) Both water and carbon dioxide 3) What property of water makes it a good evaporative coolant? a) High latent heat of evaporation b) Relatively low boiling point c) Volatility d) Transparency 4) Which process produces the most ATP per molecule of glucose? a) Anaerobic respiration in a yeast cell b) Aerobic respiration in a bacterial cell c) Glycolysis in a human liver cell d) The formation of lactic acid in a human muscle cell 5) Which type of light is least useful for photosynthesis in terrestrial plants? a) Blue b) Green c) White d) Red 6) How many molecules of water are required to completely hydrolyse a polypeptide made up of 23 amino acids? a) 11 b) 22 c) 23 d) 44 7) What does a nucleosome consist of ? a) DNA and histones b) DNA and chromatin c) Chromatin and nucleotides d) Mature RNA and histones 8) Where is chlorophyll found in a plant cell? a) Thylakoid membranes b) Stroma c) Matrix d) Cristae 9) What is produced by the light-dependent reactions of photosynthesis and used in the Calvin cycle? a) Hydrogen and oxygen b) ATP and NADPH c) NADPH and oxygen d) ATP and CO2 10) Where does the RNA polymerase bind during the process of transcription? a) The polysome b) The operator c) The promoter d) The initiator 11) Which substance in prokaryotes contains sulfur? a) DNA b) Phospholipids c) Proteins d) Antibiotics 12) What is removed during the formation of mature RNA in eukaryotes? a) Exons b) Introns c) Codons d) Nucleosomes 13) Which of these molecules is a disaccharide? a) Galactose b) Sucrose c) Cellulose d) Ribose 14) Blood is a water-based transport medium. Which property of water makes it a good transport medium? a) High specific heat b) Transparency c) Versatility as a solvent d) It has its greatest density at 4°C

Biochem revision questions

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