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Total MCQs
Unit-7 Metabolism
Answer: Metabolism is the sum of all the chemical reactions taking place inside the body of an organism.
Answer: Carbon dioxide gains hydrogen and electrons (is reduced) to form glucose during photosynthesis.
Answer: Photolysis is represented as 2H2O -> O2 + 4H+ + 4e-, so two water molecules release one oxygen molecule.
4
Answer: Catabolism breaks down complex substances into simpler ones and releases energy.
Answer: Light reactions take place in the thylakoid membranes where chlorophyll and photosystems are located.
Answer: Anabolism is the constructive phase of metabolism that builds complex molecules using energy.
Answer: The Calvin cycle occurs in the stroma, the fluid-filled region of the chloroplast.
Answer: The electron transport chain produces most of the ATP through oxidative phosphorylation.
Answer: ATP is the energy currency of the cell because it stores and releases energy for cellular work.
Answer: The dark reaction uses ATP for energy and NADPH for reducing power to fix carbon dioxide.
Answer: Chloroplasts contain chlorophyll and are the site where photosynthesis takes place.
Answer: Glycolysis occurs in the cytoplasm and does not require oxygen.
Answer: Fats need more oxygen for oxidation, so their RQ is about 0.7, which is less than 1.
Answer: Chlorophyll is the green pigment that absorbs light energy used in photosynthesis.
Answer: Four ATP are produced but two are consumed, giving a net gain of two ATP per glucose.
Answer: Leaves contain most of the chloroplasts, making them the main site of photosynthesis.
Answer: Glycolysis converts glucose into two molecules of pyruvic acid (pyruvate).
Answer: Without enough oxygen, pyruvate is converted to lactic acid in muscle cells.
Answer: Oxygen is released as a by-product when water is split during the light reaction.
Answer: The Krebs cycle takes place in the mitochondrial matrix where pyruvate enters as acetyl-CoA.