Key Concepts Quiz
This activity contains 17 questions.
Which of the following are photoautotrophs?
bacteria found in the human digestive tract
filamentous molds growing on bread
corn stalks just before harvest
deep-sea vent organisms that make organic molecules using hydrogen sulfide as an energy source
Chlorophyll is found in the _____ of chloroplasts.
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?
Plant cells possess water-splitting enzymes.
Plant cells convert carbon to combustible hydrogen.
Plant cells harness the ATP produced during photosynthesis to split water.
Plant cells break down carbohydrates to generate hydrogen.
Which of the following statements about photosynthesis is true in regard to the reduction of CO
Electrons (with accompanying protons) are added to CO
Electrons (with accompanying protons) are removed from CO
during photosynthesis and added to water molecules to form sugar.
Hydrogen is added to CO
Oxygen is removed from CO
The light reactions of photosynthesis include _____.
the Calvin cycle
reduction of CO
reduction of NADP
The conversion of NADP
to NADPH occurs with the assistance of _____.
electrons from carbon dioxide and energy from ATP
electrons from carbon dioxide and energy from sunlight
electrons from water and energy from ATP
electrons from water and energy from sunlight
Which of the following colors of light are useful during the process of photosynthesis?
blue, green, and orange
green, orange, and red
blue, red, and violet
orange, red, and violet
The primary function of light absorption by photosystems I and II is to produce _____.
a free, energized electron
Which statement regarding the light reactions is true?
Photoexcited electrons pass from photosystem I to photosystem II.
ATP synthesis occurs as electrons "fall" down the electron transport chain.
Glucose is a product of the light reactions.
Electrons are supplied to chlorophyll P680 as it reduces the primary electron acceptor.
Oxygen is to cellular respiration as _____ is to photosynthesis.
In simple summary form, the input of the Calvin cycle for every product is _____, and the output is _____ used for glucose synthesis.
a three-carbon molecule
How many turns of the Calvin cycle are required to produce one molecule of glucose?
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?
Photosynthesis drastically raised Earth's surface temperature.
Photosynthesis drastically increased the oxygen content of the atmosphere.
Photosynthesis drastically increased the carbon dioxide content of the atmosphere.
Photosynthesis allowed much higher levels of ultraviolet light to reach Earth's surface.
What is the role of photorespiration in plants?
It allows for the production of glucose and oxygen gas.
It allows plant cells to reduce the buildup of oxygen gas without opening stomata.
It creates proton gradients that are used later to supply energy needs.
It allows the shuttling of carbon to a second set of cells, where it is stored until photosynthesis can continue.
CAM plants have adapted to arid environments by closing their stomata during the day. However, photosynthesis still occurs. This is because _____.
leaks through the closed stomata
is fixed in the bundle-sheath cells
photosynthesis occurs at night
is fixed at night when the stomata are open
A large research project was recently carried out in the oceans surrounding Antarctica to learn whether adding iron-containing compounds to the iron-limited polar sea would enhance the growth of phytoplankton (small, free-floating photosynthetic organisms). This project was performed with the hope that if plankton growth were significantly increased over large areas, it might slow global warming. What is the basis for such an expectation?
The increased biomass will act as a sponge (a carbon sink) for atmospheric carbon dioxide.
The increased biomass will lead to increased levels of atmospheric oxygen through photosynthesis.
The increased biomass will lead to decreased levels of atmospheric oxygen through respiration.
The increased biomass would lead to decreased solar heating due to absorption of light by photosystems I and II.
Which gas contributes to both global warming and the deterioration of the ozone layer?
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