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Bio. U5 Yr. 1

QuestionAnswer
As the electrons travel from photosystem II down the first electron transport chain, their energy is used to... pump hydrogen ions into the thylakoid space, producing a concentration gradient that will later be used by ATP synthase to form ATP.
What correctly describes action and absorption spectra? action spectra and absorption spectra have corresponding peaks around the same wavelengths because rates of photosynthesis are higher when more light is absorbed
Where does the light-dependent reaction occur? thylakoid membrane of the chloroplast
The splitting of a water molecule by sunlight to produce oxygen, hydrogen ions, and free electrons is called... photolysis
During the light-dependent reaction, electrons are excited and leave photosystem II. Where do the electrons come from to replace these electrons? photolysis of water
What molecules are produced by the light-dependent reaction? Oxygen, ATP, and NADPH, but NOT NADP+, ADP, water, triose phosphate, or glucose
What happens during the regeneration stage of the Calvin Cycle (light-independent reactions)? The remaining G3P molecules that have not excited the cycle are used to re-form RuBP through a series of chemical reactions, so that the Calvin cycle can continue
Photosynthesis takes place inside the ____ of plant cells. chloroplast
After light excites electrons and they leave Photosystem II to travel down the first electron transport chain. How are these electrons replaced to Photosystem II? Water is split, and the electrons are given to the chlorophyll molecules of photosystem II.
In thin layer chromatography, the Rf value represents... the ratio of distances travelled by the pigment and solvent fronts
What does the light do when it strikes the chlorophyll molecules of photosystems I and II? Light causes electrons to get excited (gain energy) and travel down an electron transport chain embedded in the thylakoid membrane.
Which products of the light-dependent reactions are used in the Calvin Cycle to help form reduced organic compounds? ATP and NADPH
How can carbon dioxide concentration be varied in experiments investigating rates of photosynthesis? Add sodium bicarbonate to the water and boil water for various lengths of time to release dissolved CO2, but NOT decrease the acidity using a pH buffer or vary the distance of the plant from the light source
Why do hydrogen ions flow from the thylakoid space to the stroma through ATP synthase? They flow passively from high to low concentration via facilitated diffusion. As they flow through ATP synthase, the enzyme spins and produces ATP.
What represents the correct sequence during the reactions of photosynthesis? photosystem II --> electron transport chain --> photosystem I
What is true about the light-dependent reaction? ATP is generated by ATP synthase, but NOT chemical energy in the form of ATP is used to produce glucose, energy to power the reaction comes from the hydrolysis of glucose, or NADPH is reduced to NADP+
Sunlight is needed in the light-dependent reaction to... split water molecules
What happens during the carbon fixation stage of the Calvin Cycle (light-independent reactions)? The enzyme Rubisco attaches CO2 to RuBP, causing the formation of molecules of 3-phosphoglycerate
What happens during the reduction stage of the Calvin Cycle (light-independent reactions)? Energy from ATP and electrons from NADPH are used to reduce 3-phosphoglycerate to form G3P molecules (which can be used to form other organic molecules such as glucose)
After electrons get excited by light a second time (at photosystem I), where do they go? They travel down a second electron transport chain and are donated to NADP+, which becomes NADPH (an electron carrier)
The splitting of water at photosystem II is known as ____ and results in the production of ____. photolysis; oxygen, hydrogen ions (protons), and electrons that are given to photosystem II.
Chlorophyll a and b molecules most effectively absorb sunlight in which wavelength ranges? 650-700nm (red) and 400-450nm (blue-violet), but NOT 500-600nm (green) or 550-600nm (yellow)
When investigating rates of photosynthesis in water plants, a low pH in the solution indicates... low rates of photosynthesis because low amounts of carbon dioxide are being taken in by the plant
In the light-dependent reaction, photons of light excite electrons. This energy can then be used to... pump protons across the thylakoid membrane, creating a concentration gradient
What are structural adaptations of the chloroplast that help it performs its function? ThylakoidsHaveALargeSurfaceAreaToCarryOutTheLightDependentReaction,ThylakoidsHaveASmallInternalVolumeToAllowAHydrogen ion concentration gradient to build up quickly, and photosynthetic pigments in the photosystems are arranged to maximize light absorption
Which of the following is needed to reduce GP to G3P during the Calvin Cycle? Reduced NADP and ATP, but NOT rubisco or NADP
Thin layer chromatography is used to... separate plant pigments based on solubility
Ribulose biphosphate is also known as... RuBP
Created by: user-1907392
 

 



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