Chapter 7 PRACTICE TEST BIO 121

Which of the following are photoautotrophs? A bacteria found in the human digestive tract B filamentous molds growing on bread C corn stalks just before harvest D deep-sea vent organisms that make organic molecules using hydrogen sulfide as an energy source

Chlorophyll is found in the __________ of chloroplasts. A thylakoid membranes B stroma C thylakoid space D outer membrane

Hydrogen is a likely candidate in the search for a replacement for petroleum. However, removing hydrogen from water requires the investment of a great deal of energy. Why are plants considered to be one step ahead in the utilization of hydrogen as an alternative fuel source? A Plant cells harness the ATP produced during photosynthesis to split water. B Plant cells convert carbon to combustible hydrogen. C Plant cells possess water-splitting enzymes. D Plant cells break down carbohydrates to generate hydrogen.

Which of the following statements regarding the reduction of CO2 to sugar during photosynthesis is true? A Electrons (with accompanying protons) are added to CO2 during photosynthesis. B Electrons (with accompanying protons) are removed from CO2 during photosynthesis and added to water molecules to form sugar. C Hydrogen is added to CO2 during photosynthesis. D Oxygen is removed from CO2 during photosynthesis.

The light reactions of photosynthesis include __________. A the stroma B reduction of NADP+ C the Calvin cycle D reduction of CO2 E NADPH recycling

The conversion of NADP+ to NADPH occurs with the assistance of __________. A electrons from carbon dioxide and energy from sunlight B electrons from water and energy from sunlight C electrons from carbon dioxide and energy from ATP D electrons from water and energy from ATP

Which of the following colors of light are useful during the process of photosynthesis? A green, orange, and red B orange, red, and ultraviolet C blue, red, and violet D blue, green, and orange

The primary function of light absorption by photosystems I and II is to produce __________. A free, energized electrons B fluorescence C heat D oxygen

Which statement regarding the light reactions is true? A Photoexcited electrons pass from photosystem I to photosystem II. B Glucose is a product of the light reactions. C Electrons are supplied to chlorophyll P680 as it reduces the primary electron acceptor. D Electrons "falling" down the electron transport chain are deposited on ADP to form ATP.

Oxygen is the final electron acceptor for cellular respiration. What is the final electron acceptor in the light reactions of photosynthesis? A light B water C ATP D NADP+

In simple summary form, the input of the Calvin cycle for every product is __________, and the output is __________ used for glucose synthesis. A NADP+ ...; NADPH B 3 CO2 ...; a three-carbon molecule C 6 CO2 ...; glucose D ADP ... ATP

How many turns of the Calvin cycle are required to produce one molecule of glucose? (ebook Module 7.10) A one B two C three D six

Current evidence indicates that the process of photosynthesis arose more than three 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? A Photosynthesis drastically raised Earth's surface temperature. B Photosynthesis drastically increased the carbon dioxide content of the atmosphere. C Photosynthesis allowed much higher levels of ultraviolet light to reach Earth's surface. D Photosynthesis drastically increased the oxygen content of the atmosphere.

CAM plants have adapted to arid environments by closing their stomata during the day. However, photosynthesis still occurs. This is because __________. A CO2 is fixed at night when the stomata are open B CO2 is fixed in the bundle-sheath cells C photosynthesis occurs at night D some CO2 leaks through the closed stomata

What is the potential benefit of photorespiration in plants? A It allows plant cells to reduce the buildup of oxygen gas without opening stomata. B It allows the shuttling of carbon to a second set of cells, concentrating carbon dioxide. C It creates proton gradients that are used later to supply energy needs. D It allows for the production of glucose and oxygen gas.

A large research project was 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? A The increased biomass will lead to decreased levels of atmospheric oxygen through respiration. B The increased biomass would lead to decreased solar heating due to absorption of light by photosystems I and II. C The increased biomass will lead to increased levels of atmospheric oxygen through photosynthesis. D The increased biomass will act as a sponge (a carbon sink) for atmospheric carbon dioxide.

Which gas contributes to both global warming and the deterioration of the ozone layer? A carbon dioxide B CFCs C oxygen D methane