BIO HW CH 10

What is produced by light dependent reactions? -light energy -water -Chlorophyll -Energy rich ATP and NADPH

-Energy rich ATP and NADPH

Arrange the events of the light dependent reactions of photosynthesis in the order that they occur -ATP and NADPH are produced -Photons of light excite electrons on specific chlorophyll molecules -chlorophyll molecules release electrons that travel down an electron transport chain -H plus ions flow out of the thylakoid through an enzyme channel -Hydrogen ions are pumped into the interior of the thylakoid

-Photons of light excite electrons on specific chlorophyll molecules -chlorophyll molecules release electrons that traveled down an electron transport chain -hydrogen ions are pumped into the interior of the thylakoid -H plus ions flow out of the thylakoid through an enzyme channel -ATP and NADPH are produced

What is needed for light dependent reactions? -light energy -water -Chlorophyll -Energy rich ATP and NADPH

-light energy -water -Chlorophyll

During one of the three phases of the Calvin cycle, the carbon atoms form three CO2 molecules and are incorporated into three five-carbon sugar molecules called ribulose biphosphate (RUBP). This reaction forms and unstable six carbon intermediate which immediately split into three carbon sugar molecules called 3-Phosphoyceric acid (3PGA). In which phase of the Calvin Cycle does this occur? a) light dependent reactions b) carbon fixation c) reduction d) regeneration

B) carbon fixation

During the light dependent reactions of photosynthesis, energy excites electrons in chlorophyll molecules, transforming the energy into chemical energy. What provides the energy that excites the electrons in the chlorophyll molecules? a) CO2 b) sunlight c) NADPH d) water

B)sunlight

What is the source of the electrons that replaced excited electrons lost from chlorophyll? a)CO2 b)water c)NADPH d)sunlight

B)water

Which statement accurately describes the Calvin cycle?Which statement accurately describes the Calvin cycle? a) The Calvin cycle is a light independent metabolic pathway occurring in the chloroplast stroma that converts carbon from carbon dioxide into sugar b) the Calvin cycle is an anaerobic metabolic pathway of ATP formation during which glucose is converted to alcohol and tuna ATP molecules c) The Calvin cycle is a light dependent metabolic pathway occurring in the chloroplast thylakoid membrane that captures energy from sunlight with chlorophyll and converts it to ATP

a) The Calvin cycle is a light independent metabolic pathway occurring in the chloroplast stroma that converts carbon from carbon dioxide into sugar

Plants synthesize their own food in the form of sugars during the process of photosynthesis. Which of the statements describe photosynthesis? a) convert carbon dioxide to sugars, releasing oxygen b)Produces sugars for the plant using the energy from sunlight c)It's a cellular process that occurs in the chloroplast of plant cells d)Produces sugars for the plant using only the nutrients in the soil

a) convert carbon dioxide to sugars, releasing oxygen b)Produces sugars for the plant using the energy from sunlight c)It's a cellular process that occurs in the chloroplast of plant cells

During one of three phases of the Calvin cycle, three molecules of ATP are used to catalyze the rearrangement of five three- carbon sugar's known as glyceralde 3-phosphate (G3P), into three five-carbon sugars, known as ribulose biphosphate (RuBp). One other molecule of G3P is exported to the cytoplasm to form glucose. In which phase of the Calvin cycle does this occur? a) regeneration b) Light dependent reactions c) reduction d) carbon fixation

a) regeneration

Choose all the events that occur during the light dependent reactions of photosynthesis. a)Excited electrons help move H plus ions to create a concentration gradient b) CO2 is incorporated into energy rich carbohydrate molecules c) H plus ions are used to help produce the energy carriers, ATP and NADPH d)Light energy is used to excite electrons on specific chlorophyll molecules

a)Excited electrons help move H plus ions to create a concentration gradient c) H plus ions are used to help produce the energy carriers, ATP and NADPH d)Light energy is used to excite electrons on specific chlorophyll molecules

Which of the given scenarios is a different effect of the absence of carbon dioxide during photosynthesis? a)The carbon fixation stage of the Calvin cycle would be unable to synthesize the sugar 3-PGA b) The regeneration phase of the Calvin cycle would be unable to replenish the sugar RUBP C)The electron transport chain of the light dependent reactions would be unable to synthesize a TP

a)The carbon fixation stage of the Calvin cycle would be unable to synthesize the sugar 3-PGA

Consider what happens to energy and photosynthesis. How does this differ from what happens to energy and cellular respiration. a)Photosynthesis releases energy from storage molecules, whereas cellular respiration puts energy from light into these molecules b)In photosynthesis, energy is captured from light, where as in cellular respiration energy is transferred from storage molecules to ATP C) plants create energy using carbon dioxide and water and photosynthesis, whereas they gather extra energy from light during cellular respiration d)Energy is stored in both processes, but photosynthesis only happens in plants and cellular respiration only happens in animals

b)In photosynthesis, energy is captured from light, where as in cellular respiration energy is transferred from storage molecules to ATP

Select the descriptions that apply to the thylakoid. a)The thylakoid membrane is the side of the light independent reactions of photosynthesis b)The thylakoid membrane is the site of an electron transport chain that generates cellular energy from light energy c)Do you thylakoid membrane is the site of the light dependent reactions of photosynthesis d)Thylakoids are arranged within the chloroplast and two stacks of coin shaped disc called grana

b)The thylakoid membrane is the site of an electron transport chain that generates cellular energy from light energy c)Do you thylakoid membrane is the site of the light dependent reactions of photosynthesis d)Thylakoids are arranged within the chloroplast and two stacks of coin shaped disc called grana

Which statement describes the function of photosynthetic pigments in leaves? a)They convert energy from sunlight to energy in simple sugars b)They capture light energy and remove electrons from a donor c)They allow carbon dioxide to enter the cell throughout the stomata d) they sequester nutrients in the leaves of green food plants e)They block light from sensitive energy generating areas of the cell

b)They capture light energy and remove electrons from a donor

During one of three phases of the Calvin cycle, SIX molecules of NADPH are used to transfer electrons to six three- carbon sugar's known as 3-phosphoglyceric acid (3PGA). The transfer of electrons forms the six 3PGA molecules into six molecules of a three-carbon sugar called gluceraldehyde 3-phosphate (G3P). In which phase of the Calvin cycle does this occur? a) light dependent reactions b) carbon fixation c) reduction d) regeneration

c) reduction

What is visible light? a)The blend of all the wave links of radiation in the electromagnetic spectrum b)The segment of the electromagnetic spectrum that cannot be used for photosynthesis c)The portion of the electromagnetic spectrum most often used by living organisms d)The ultraviolet and infrared wave links in the electromagnetic spectrum of radiation

c)The portion of the electromagnetic spectrum most often used by living organisms