BIO 100 Lecture Notes - Lecture 9: Electron Transport Chain, Light-Independent Reactions, Photosynthetic Reaction Centre

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aquamarinebat616

5 Mar 2017

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Photosynthesis part 2 (chapter 8: looking at biochemical process. 2 stages of photosynthesis: the light reactions (photo, the calvin cycle (synthesis, both intimately tied biochemical reactions, but separate, all organisms have these reactions. A photosystem consists of a reaction-center complex (a type of protein complex) surrounded by light-harvesting complexes. The light-harvesting complexes (pigment molecules bound to proteins) funnel the energy of photons (via resonance) to the reaction center. A primary electron acceptor in the reaction center accepts an excited electron from chlorophyll a: not allow a bond to break, give up an electron at the right wavelength. In the porphyrin ring, it allows electrons to be packed together and stabilize with mg ion. Double and single bonds are in there. Electron transport system: electrons from photosynthesis come from water, this is the electron transport system, what is the goal, to move electrons to a place where it can do beneficial work.

Related Questions

Photosynthesis (Ch 8)

List the locations of the light reactions & the Calvincycle within the chloroplast and identify location on adiagram
Use the absorption spectrum of a pigment to identifywavelengths absorbed and reflected by that pigment
Describe the events of the light reactions including:

Excitation of electrons vs donation of electrons
Pathway of excited electrons through photosystem II, firstelectron transport chain, photosystem I and 2^nd electrontransport chain
Sources of electrons in photosystems I and II
ATP production using energy from an electron transportchain

List the products of the light reactions
Explain the indirect role of light reactions vs direct role ofCalvin cycle reactions in sugar production
Describe Calvin cycle events

Carbon fixation
Regeneration of CO₂ acceptor molecule (RuBP)

Explain the function of the Calvin cycle in plant cellularmetabolism
Compare & contrast electron transport and ATP synthesisbetween cellular respiration and photosynthesis

cerisegoldfish403

35. During the complete catabolism of glucose, CO2 is released during ____ (note: Krebs cycle = citric acid cycle)
A. glycolysis only
B. Krebs cycle only
C. Krebs cycle and oxidation of pyruvate
D. oxidation of pyruvate only
E. Krebs cycle, glycolysis and oxidation of pyruvate

36. A reaction center, a primary electron acceptor and many chlorophyll molecules are all components of a/an _________ .
A. fluorescence center
B. photosystem
C. electron transport chain
D. carbon-fixation unit
E. electromagnetic spectrum

37. Which of the following generates the most reducing power?
A. anabolism of isoleucine
B. Calvin cycle
C. glycolysis
D. citric acid cycle
E. Hobbes reactions

38. After completion of the citric acid cycle (Krebs cycle), most of the usable energy from the original glucose molecule is in the form of _____.

A. acetyl CoA
B. ATP
C. NADH
D. CO2
E. FADH2

39. The light reactions of photosynthesis occur in:
A. all membranes of the chloroplast
B. the stroma
C. the matrix
D. the tonoplast membrane
E. thylakoid membranes

40. When chloroplasts are illuminated with white light, chlorophyll primarily absorbs:
A. photons of all wavelengths
B. green light only
C. red light only
D. blue light only
E. red and blue light

goldwallaby134

Photosynthesis

Light Reactions:

Photosynthesis is the process of reducing/oxidizing (circle one) _____________________ to produce ___________________. This overall reduction-oxidation reaction requires _________________ to begin the flow of __________________. Photosynthetic ____________________ absorb light energy and are located in ___________________ found embedded within the membranes of __________________. The most prevalent one include the ___________________ which reflect ________________ light and absorb the other wavelengths of light. Accessory pigments include ___________________. When light energy is absorbed in photosynthesis, electrons of pigment molecules become _________________ and move into higher potential energy _______________. When the electrons return to their previous position, _____________ is passed to the ______________________ pigment molecule. Electrons within this pigment molecule move to a high potential energy state and are âgrabbedâ by _________________________ chains. Electrons from photosystem II are passed to ______________________. Electrons from photosystem I are passed to _________________. As electrons move in the electron transport chain associated with photosystem I/II (circle one), the energy released is used to power ___________ pumps and __________ is produced via a process known as ________________________. Photosystem I/II (circle one) electrons must be replaced to continue the reaction so ____________ is split for its electrons. The products _______________ & _______________ then proceed to the ______________________ cycle.

Calvin Cycle:

The Calvin Cycle can be broken into 3 main series of reactions. In the first group, known as the __________________ step, ______________________ combines with 3 molecules of ____________________ to form 6 molecules of _____________________. This reaction is catalyzed by ___________________. ________________ can act as a competitive inhibitor of this enzyme, shutting down this step in a process known as ______________________________. In the second series of reactions known as the __________________ steps, the molecules produced in the previous step get oxidized/reduced (circle one). The source of electrons is _________from the light reactions. This step is endergonic/exergonic (circle one) and thus requires _______ from the light reactions. Six molecules of _____________________ are produced, ______ (#) of which will continue in biosynthetic pathways to produce __________________. The remaining molecules will then enter the ______________________ steps which require _____________ from the light reaction. In this step, 3 molecules of _______________ are produced so that this cyclic reaction can continue.

BIO 100 Lecture Notes - Lecture 9: Electron Transport Chain, Light-Independent Reactions, Photosynthetic Reaction Centre

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