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BIOA01 MODULE 1 Lec 09
Lecture 9 Module 1 Photosynthesis
23
Biology
Undergraduate 1
09/24/2013

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Term

Photosynthesis' key product is ________

Glycolysis' key product is ________

 

Definition

Glucose

Pyruvate

Term

In aerobic conditions, anabolic metabolic pathways use ________ for energy making.

 

It yields (traps) ______ ATP

Its waste products are ________

It undergoes _______ oxidation

Definition

Cellular respiration

32

C02 and water

Complete

Term

In anaerobic conditions anabolic metabolic pathways use ___________ for energy making.

 

It yields (traps) ______ ATP.

It's waste products are _________

It undergoes _______ oxidation. 

Definition

Fermentation

2

Organic compound and C02

incomplete

Term

What uses photosynthesis?

What do many of them use?

Do all of them produce carbohydrates and 02?

Definition

Photoautotrophs

Light energy, Water, C02

Many of them do, but not all.

Term
What is photosynthesis?
Definition
Conversion of C02 into organic molecules using light energy
Term
There are two stages of photosynthesis : List and describe them
Definition

Light reactions : Capture light energy to synthesize ATP and NADPH

 

Calvin Cycle : Electrons and protons of NADPH and energy of ATP converts C02 into carbohydrates

Term

What is the general formula for photosynthesis?

 

 

Where does the 02 derived (split) from in the formula?

How was this discovered?

Definition

6*C02 + 12*H20 -> C6H1206 + 6*02 + 6*H2

 

 

The 02 was derived from H20, this was discovered from studying photoautotrophic bacteria that did not produce 02. (Used H2S and produces S instead of using H20 and producing 02)

 

 

Term
Why is photosynthesis so important?
Definition

Glucose is a major product of photosynthesis

Reduced carbon is a source of carbon for lipids, proteins and nucleic acids.

 

 

ALL organic molecules are a direct or indirect result of photosynthesis

Term
What are the sites of photosynthesis?
Definition
Stroma and Thylakoid membranes
Term
What happens in the thylakoid membrane and the stroma?
Definition

In the thylakoid membrane, the light reactions occur.

Proteins, pigments, electron transfer carriers and ATP synthase help carry the light reactions.

 

In the Stroma, the Calvin cycle happens. Enzymes in the stroma help the calvin cycle happen..

Term

Light energy comes in packets of ________ that have ___________.

 

Light energy is ____________ to its wavelength.

Definition

Photons

Wavelike Characteristics

 

Inversely proportionate

Term
Photosynthetic organisms use special molecules called PIGMENTS that absorb light in the visible spectrum : ___nm - ___nm
Definition
400nm-700nm
Term
Why are chloroplasts green?
Definition
They are green because they absorb red and blue light, and reflect green light
Term

Light reactions occur in the __________

 

 

What are photosystems?

Definition

Thylakoid membranes

 

Photosystems are assemblies of pigment-proteins where light reactions occur 

Term

Describe Chlorohyll P680

Describe Chlorophyll P700

Definition

Chlorophyll P680 absorbs light with the maximum wavelength of 680. They are photosystem two.

 

Chlorophyll P700 absorb light with the maximum wavelength of 700. They are photosystem one.

Term

Page 17 read up and memorize process of photosynthesis

 

page 18 read up on chemiosmosis

 

19 - 20 - 21 read up youtube light dependant cyclic and non cyclic

Definition
page 17
Term
Explain the processes of carbon fixation.
Definition

1) C02 reacts with a five carbon molecule RuBP with the help of Rubisco reacting in a six carbon skeleton molecule

 

2) Six carbon skeleton break down to two molecules of 3PG

 

C02 + CO2 ->(With rubisco help)-> Six carbon molecule

 

->(break down)-> Two molecules of 3PG

Term
Explain the process of reduction to carbohydrate of G3P.
Definition

3-PG is Phosphorylated into 1,3-GP

 

P-C-C-C -> P-C-C-C-P

 

1,3 GP reduced (added H) to 3PG via the help of NADPH

 

NADPH  + P-C-C-C-P -> C-C-C-P + Pi + NADP^+ 

Term
Explain the regeneration of RuBP.
Definition

RuBP is made from 3 turns of the cycle.

 

(2 G3P per cycle) * 3 = 6 G3P

 

6G3P = 6C * 3 = 18C

 

RuBP = 5C so THREE RuBP is made

 

3C leftover, so there is a surplus of ONE G3P per every THREE turns.

Term
G3P is the starting point of ______________.
Definition

Nearly ALL organic molecules.

 

E.g Amino Acids, Nucleic acids, Carbs, fats

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