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MCQs

Total Questions : 88 | Page 7 of 9 pages
Question 61. . Which of the following statements about energy metabolism is false?
  1.    The energy that powers living systems ultimately comes from the sun
  2.    All animals in some way rely on plants for their energy
  3.    Plants provide the water and CO2 that animals need to carry out respiration
  4.    All eukaryotic organisms carry out respiration in the presence of O2
 Discuss Question
Answer: Option C. -> Plants provide the water and CO2 that animals need to carry out respiration
Question 62. . During the light-dependent reactions of photosynthesis, which of the following does not occur?
  1.    Splitting of water
  2.    Carbon dioxide fixation
  3.    Release of oxygen
  4.    Absorption of light energy by photosystems
 Discuss Question
Answer: Option B. -> Carbon dioxide fixation
Question 63. . Carbon dioxide is reduced in
  1.    noncyclic photophosphorylation
  2.    the Calvin cycle
  3.    the light reactions
  4.    both light and dark reactions
 Discuss Question
Answer: Option B. -> the Calvin cycle
Question 64. . What is the maximum absorption wavelength for photosystem I in green plants?
  1.    550 nm
  2.    600 nm
  3.    700 nm
  4.    750 nm
 Discuss Question
Answer: Option C. -> 700 nm
Question 65. . A eukaryotic cell that can carry out only fermentation instead of the complete aerobic respiration of glucose
  1.    produces less CO2
  2.    is lacking in O2
  3.    has mitochondria present
  4.    all of these
 Discuss Question
Answer: Option D. -> all of these
Question 66. . Which of the following structures or processes are logically associated with chloroplasts?
  1.    Plant cells
  2.    Chlorophyll
  3.    Thylakoid membranes
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Question 67. . In oxygenic photosynthesis, water is split in order to provide the
  1.    electrons needed to reduce P680
  2.    O2 needed for the dark reactions
  3.    electrons needed to reduce NADH
  4.    electrons needed for cyclic photophosphorylation
 Discuss Question
Answer: Option A. -> electrons needed to reduce P680
Question 68. . Where do the protons come from that make up the proton gradient used in the light reactions of photosynthesis?
  1.    Glucose
  2.    ATP
  3.    H2O
  4.    NADPH
 Discuss Question
Answer: Option C. -> H2O
Question 69. . Which of the following serves as a reactant in photosynthesis and a product in cellular respiration?
  1.    O2
  2.    CO2
  3.    Sunlight
  4.    ATP
 Discuss Question
Answer: Option B. -> CO2
Question 70. . The cytochrome c oxidase complex
  1.    accepts electrons from cyt c
  2.    donates four electrons to O2
  3.    pumps protons out of the matrix space
  4.    all of these
 Discuss Question
Answer: Option D. -> all of these

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