Photosynthesis

Where does the Calvin cycle occur?

The light reactions of photosynthesis use _____ and produce _____. -NADPH ... NADP+ -carbon dioxide ... sugar -carbon dioxide ... oxygen -water ... NADPH -NADPH ... oxygen

Why was Mr. Priestly unable to keep a mouse, sealed in a container together with a plant, alive in his basement? -The basement was too hot, which killed the mouse. -The plant he used in his experiments in the basement was not edible. -The plant did not get the light needed for photosynthesis. -The plant in the basement used up all the oxygen it made in photosynthesis for its own cellular respiration.

Which of the events listed below is part of the light reactions of photosynthesis? -Light is absorbed and used to extract electrons from sugar. -ADP is phosphorylated to form ATP. -Carbon dioxide is incorporated into a sugar. -NADP+ is produced. -Water is produced.

The light reactions of photosynthesis occur in the -stroma fluid -thylakoid membranes -cytosol fluid -mitochondria -chloroplast fluid space

The oxygen released by photosynthesis is a by-product of which specific reaction? -conversion of carbon dioxide (CO2) to sugar -extraction of electrons from water molecules -synthesis of water molecules -converting ADP to ATP -extraction of electrons from CO2

The light-driven movement of protons (H+) from the stroma to the inner thylakoid space across the thylakoid membrane occurs from ______ to ______ proton concentration.

The movement of protons (H+) through the ATP synthase occurs from ______ to ______ proton concentration

In their FIRST step, the energy of which of the following is used by the chloroplasts light reactions to catapult electrons from low to high potential energy. -sugars -NADPH -CO2 -ATP -sunlight

The light reactions convert the high potential energy of energized electrons to the energy stored in -ATP and NADPH -ATP and sugars -CO2 and sugars -ATP and H2O -NADPH and H2O

Fill in the blanks: In the model of the hydroelectric dam, water stands for ________, the turbine stands for ________, and the lit-up light bulb stands for _________. -the ATP synthase; the protons (H+); the ATP produced -the protons (H+); the ATP produced; the ATP synthase -the protons (H+); the ATP synthase; the ATP produced -the ATP produced; the protons (H+); the ATP synthase

Where do the reactions of the Calvin cycle take place? -thylakoid membranes -stroma fluid of the chloroplast -cytosol fluid surrounding the chloroplast -chlorophyll molecule -outer membrane of the chloroplast

Carbon dioxide containing bonds with ________ held electrons is converted to sugar molecules containing bonds with ______ held electrons in the Calvin cycle.

What is the primary function of the Calvin cycle? -to use NADPH to release carbon dioxide -to synthesize starch from carbon dioxide -to extract electrons from water and release oxygen -to synthesize a simple sugar (G3P) from carbon dioxide -to use ATP and NADPH to convert a simple sugar (G3P) to carbon dioxide

True or False? If you could track carbon atoms, you would find carbon atoms from CO2 as part of sugar and starch molecules in plant leaves and also as a part of sugar and glycogen molecules in animals

Which of the following statements is correct? -The light reactions provide the Calvin cycle with oxygen, and the Calvin cycle provides the water for the light reactions. -The light reactions provide ATP and NADPH, and the Calvin cycle provides sugar for the light reactions. -The light reactions provide the CO2 that is converted to sugar in the Calvin cycle. -The light reactions provide ATP and NADPH to the Calvin cycle.

Comparing the photosynthetic light reactions with the Calvin cycle, which CONSUME(S) ATP? -both the light reactions and the Calvin cycle -neither the light reactions nor the Calvin cycle -only the light reactions -only the Calvin cycle

Comparing the photosynthetic light reactions with the Calvin cycle, which PRODUCE(S) NADPH? -both the light reactions and the Calvin cycle -neither the light reactions nor the Calvin cycle -only the light reactions -only the Calvin cycle

Comparing the photosynthetic light reactions with the Calvin cycle, which CONSUME(S) glucose? -both the light reactions and the Calvin cycle -neither the light reactions nor the Calvin cycle -only the light reactions -only the Calvin cycle

The Calvin cycle converts _______ to _______. -C-H bonds; C=O bonds -carbon dioxide; water -C=O bonds; C-H bonds -C-H bonds; carbon dioxide -water; carbon dioxide

The glucose made in photosynthesis is used by the plant in three of the following processes. Find the exception. -cellulose synthesis -synthesis of starch as an energy store -to fuel the plants cellular respiration -synthesis of glycogen as an energy store

Four of the following statements are correct. Find the one that is FALSE. While performing photosynthesis during the day, the chloroplasts of a green leaf produce -ATP to be used in the Calvin cycle. -ATP as an energy source for the roots of the plant. -sugars for the green leafs cellular respiration at night. -sugars as an energy source for the roots of the plant. -sugars to fuel the growth of the plant.

Why do plants use the ATP made by ATP synthase to produce sugars? -because animals prefer sugars (due to their sweet taste) over ATP -because the ATP made in plant photosynthesis is different from the ATP made in cellular respiration, and only the ATP made in respiration is able to fuel cellular work -because ATP is too unstable to store for more than an instant

Four of the five features below present a state of high chemical potential energy in photosynthesis. Find the exception. -glucose -excited electrons -NADPH -ATP -water

Three of the four answers below explain why a plants green leaves typically have higher rates of photosynthesis compared to respiration. Find the EXCEPTION. -The green leaf is only a small part of the plant and needs to produce enough energy-rich sugars to support all of the non-photosynthetic parts (like roots, non-green stems and trunks, or flowers). -Only when overall photosynthetic activity exceeds overall respiration activity of the whole plant can the plant grow and accumulate biomass. -Sugar produced in photosynthesis supports the energy needs of the plant during the day and the night. -The rate of photosynthesis is higher because leaves dont have mitochondria.