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QLDBiologyQuick questions
Unit 1: Cells and multicellular organisms
Quick questions on Photosynthesis and cellular respiration (QCE Biology Unit 1)
6short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is energy in context?Show answer
ATP is the cell's energy currency. Hydrolysis of one phosphate bond releases about 30 kJ per mol, used to power active transport, biosynthesis, muscle contraction and many other processes. Cells regenerate ATP from ADP and Pi continuously using energy from respiration (or photosynthesis in chloroplasts).
What is word equation?Show answer
Carbon dioxide + water + (light energy) → glucose + oxygen.
What is balanced chemical equation?Show answer
6 CO2 + 6 H2O + light energy → C6H12O6 + 6 O2.
What is q1?Show answer
Write the summary equation for aerobic cellular respiration and state the location and ATP yield of each of glycolysis, Krebs cycle and oxidative phosphorylation. [4 marks]
What is q2?Show answer
A leaf was placed in a sealed chamber under increasing light intensities and CO2 fixation was measured at 0, 5, 15 and 35 percent full sunlight, giving 0, 8, 18 and 22 micromoles CO2 per minute. Identify the limiting factor at low light and at high light, and predict the trend if temperature rises from 20 to 35 degrees Celsius. [3 marks]
What is q3?Show answer
Compare aerobic and anaerobic respiration. (a) State the location and final electron acceptor of each. (b) Explain why anaerobic yield is so much lower.
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