Hydrogen is a leading candidate in the search for a petroleum replacement. However, the hydrogen-generating reaction requires more energy than it produces. Why are plants considered to be one step ahead in the utilization of hydrogen as an alternative fuel source?
A) Plant cells break down carbohydrates to generate hydrogen.
B) Plant cells possess water-splitting enzymes.
C) Plant cells convert carbon to combustible hydrogen.
D) Plant cells harness the ATP produced during photosynthesis to split water.
Answer: B
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Photosynthesis
- Which of the following has been a major source of ozone destruction over the past 50 years?
- Ozone
- Which of the following statements about the greenhouse effect is true?
- Global warming due to the greenhouse effect may be
- Plant cells
- Plants use sugars as
- The ultimate source of all the food we eat and the oxygen we breathe is
- The process of photosynthesis arose roughly two billion years ago. Its origin had a huge impact on existing organisms and on the physical characteristics of the biosphere. Which major physical change could be attributed to photosynthesis?
- ATP and NADPH
- Photosynthetic organisms derive their carbon from
- Mitochondria transfer ________ energy from ________ to ATP; chloroplasts transform ________ energy into the chemical energy of ATP.
- Oxygen is the final electron acceptor for cellular respiration. What is the final electron acceptor in photosynthesis?
- The electrons lost from the reaction center of photosystem II are replaced by electrons from
- The primary function of light absorption by photosystems I and II is to produce _____.
- Plant cells are protected from the harmful effects of reactive oxidative molecules by
- Why are most plants green?
- The full range of electromagnetic energy is called the ________ spectrum.
- Which of the following statements regarding photosynthesis is false?
- The light reactions of photosynthesis include _____.
- What is the source of energy that provides the boost for electrons during photosynthesis?
- Which of the following statements concerning the role of redox reactions in photosynthesis and cellular respiration is true?
- A redox reaction involves the transfer of
- The oxygen released into the air as a product of photosynthesis comes from
- CO2 enters and O2 escapes from a leaf via