chapter#8 Flashcards
NADPH is made as a result of:
the electron transport chain that follows photosystem1 (helps to full)NADPH carries protons and election, being reduced
explain:
The formation of a proton gradient is important for the synthesis of ATP, not NADPH. The Calvin cycle uses NADPH, it does not make NADPH. NADP reductase is not able to absorb photons - pigments such as chlorophyll do this.
In noncyclic photophosphorylation, the electrons passed down through the electron transport system are ultimately obtained from:
Water
How does an electron transport chain lead to the generation of ATP in the light-dependent reactions of photosynthesis?
The movement of electrons down the electron transport chain drives protons into the thylakoid space, generating a chemical gradient that is used to make ATP.
If there is a mutation in one of the genes encoding a component of the P700 reaction center complex such that all copies of this complex are nonfunctional in a particular bacterial cell, what would be the result?
This bacterial cell would not be able to harness light energy to form NADPH.
What would be the immediate consequence if all of the glyceraldehyde 3-phosphate made during the carbon fixation and reduction phases of the Calvin cycle were used to make glucose?
Plant cells would not be able to regenerate RuBP
what is RuBP?
it is in the Calvin cycle , the 5 carbon sugar to which CO2 is attached ( catalyzed by rubisco)
In green plants, what is the sequence of Photosystems, and what does each Photosystem produce?
Photosystem II -> ATP production -> Photosystem I -> NADPH production
If a mutation arose in the cytochrome/b6-f complex, making it completely non-functional, what would be the immediate result?
Light energy could not be harnessed to generate ATP in the cells containing the mutation.
what is b6-f complex?
an enzyme found in the thylakoid membrane that transfers electrons from photosystem 2 to photosystem 1, and pumps protons(h+) into the thylakoid space creating an electrochemical gradient used to create ATP from ADP
What replaces the electrons excited by sunlight in photosystem I?
Electrons from photosystem II
If the gene encoding a specific enzyme in the plastoquinone biosynthetic pathway was mutated in a particular cell such that it became completely nonfunctional, what immediate effect would that have on that cell?
The cell would be unable to use light energy to make ATP
Carotenoids absorb light in the blue and _____ region of the spectrum.
green
what kind of pigment absorbs blue and green on the spectrum?
carotenoids
Chlorophyll is the main pigment found in plants. Other pigments are also present. If these other pigments were lost from a plant, but chlorophyll remained, the plant would no longer be able to:
absorb wavelengths of light outside those absorbed by chlorophyll
In 1771, Joseph Priestly conducted an experiment where he put a living mint spring into a glass container with a lit candle. This container was then closed so that air could not escape or enter. Once inside the closed container, the candle burned for a certain period of time, and then went out. After approximately one month, Priestly attempted to re-light the candle inside the closed container using a mirror to focus sunlight onto the wick. He was successful in lighting the candle again using this approach. What do the results of this specific experiment allow you to conclude about plants?
Plants can generate oxygen
