BIOLOGY 151 Lecture Notes - Lecture 2: Light-Independent Reactions, Carbon Fixation, Ribulose

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14 Feb 2018

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The calvin cycle and carbon fixation: two separate but linked processes in photosynthesis, the energy transformation of the light-dependent reactions, the carbon dioxide reduction of the calvin cycle. The calvin cycle: the calvin cycle has three phases, fixation: co2 reacts with ribulose bisphosphate (rubp) Attachment of co2 to an organic compound is carbon fixation: reduction: the 3-phosphoglycerate molecules are: The importance of rubisco: the co2-fixing enzyme is, ribulose 1,5-bisphosphate carboxylase/oxygenase (rubisco, rubisco is, found in all photosynthetic organisms, that use the calvin cycle to fix carbon, thought to be the most abundant enzyme on earth. Inefficient because it catalyzes the addition of co2 to rubp (cid:894)a desired out(cid:272)o(cid:373)e(cid:895) (cid:271)ut . It also catalyzes the addition of o2 to rubp (which is not a desired outcome) Photorespiration: when photorespiration occurs, the rate of photosynthesis declines drastically, carbon fixation is favored over photorespiration when. Are leaf structures where gas exchange occurs.

Related Questions

a.	light-dependent reactions
b.	CAM pathway
c.	carbon dioxide fixation
d.	Calvin-Benson cycle
e.	C4 pathway

PGAL molecules are formed from the reaction of PGA molecules with ATP and NADPH in this pathway.â

________

peachhippopotamus43

13.

Carbon fixation in plants refers to _____.

the reaction between any two carbon containing molecules.

the breakdown of glucose.

the synthesis of carbon dioxide.

the reaction between carbon dioxide and RuBP.

14.

The electrons that are excited by light energy in photosystems II and I are eventually used to_____.

breakdown RuBP

convert glucose to carbon dioxide

breakdown starch into glucose

reduce NADP+ to NADPH

15.

The light reaction of photosynthesis occurs in the ______.

thylakoid membranes

stroma

cytoplasm

matrix

16.

The final product of the Calvin cycle is ______.

		citrate
		G3P (glyceraldehyde 3-phosphate)
		lactate
		pyruvate

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

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BIOLOGY 151 Lecture Notes - Lecture 2: Light-Independent Reactions, Carbon Fixation, Ribulose

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