C17 Photosynthesis Flashcards

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1
Q

Limiting factor

A

One factor needed in photosynthesis and is in short supply, reducing the rate of photosynthesis.

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2
Q

Light intensity affect on photosynthesis

A

Light needed, energy source, as light intensity increases, ATP and reduced NADP production increases, increasing rate of photosynthesis

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3
Q

CO2 conc affect on photosynthesis

A

Needed, source of carbon, increases CO2 conc increases rate carbon fixation, therefore increasing rate TP production

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4
Q

Temperature affect on rate of photosynthesis

A

As temp increases, rates of enzymes controlled reactions increase.

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5
Q

When do stomata close and how does this effect the rate of photosynthesis

A

Dry spells (when plants undergo water stress) to avoid water loss.
Preventing diffusion of CO2, decreasing rate light-independant reaction and eventually stopping photosynthesis

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6
Q

Is water a limiting factor in photosynthesis and why

A

Never, because by the time the water potential to become low enough to limit the rate, the plant would have already closed stomata and ceased photosynthesis processes.

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7
Q

Law of limiting factors states…

A

Rate of physiological process will be limited by factor in shortest supply

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8
Q

Effect reducing light intensity on Calvin Cycle

A

-Reduces rate light dependant stage
-Reducing quantity ATP and Reduced NADP
-Conc GP therefore increases and conc TP decreases, less TP generates less RuBP
-Reverse happens when light intensity increases

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9
Q

Effect temperature on Calvin Cycle

A

-All reactions Calvin Cycle catalysed by enzymes
-Lower temp, enzyme and substrate lower KE, less successful collisions, decreases rate reaction
-Decreases conc GP, TP, RuBP
-Same effect high temp, denaturing, irreversible

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10
Q

Effect Carbon Dioxide on Calvin Cycle

A

Low conc CO2, decreases conc GP (as there’s less CO2 to be fixed)
-Decreases conc TP
-Conc RuBP increases, still being formed from TP, but not being used to fix CO2

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11
Q

What does an ecosystem composition depend on

A

The amount of energy

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12
Q

Provide some ways energy consumption is used up

A

Homeostasis
Respiration
Growth and reproduction

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13
Q

How is ADP formed

A

ATP and an inorganic phosphate

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14
Q

The Calvin Cycle is the starting point of what

A

Making all the organic substances plants need (e.g glucose)

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15
Q

What are TP and GP used to make

A

Carbohydrates, lipids and amino acids

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16
Q

Carbohydrates (what they made up off)

A

Hexose sugars made joining 2 TP mols.
Larger carbohydrates (sucrose, starch, cellulose) made by joining hexose sugars different ways

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17
Q

Amino acids (what are they made from)

A

Some are made from GP

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18
Q

Lipids (what are they made from)

A

Made using glycerol, whichs synthesised from TP and fatty acids, whichs synthesised from GP

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19
Q

Whats chronography used for

A

Separating different pigments

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20
Q

Mobile phase

A

Solution containing mixture of pigments

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21
Q

Stationary phase

A

Think layer of silica gel applied to glass

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22
Q

Why do the pigments move at different rates up the TLC paper

A

Different solubilities in mobile phase and differing interactions with stationary phase leads to them moving different rates through silica gel

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23
Q

Retention value (Rf)

A

Distance travelled by component / Distance traveled by solvent

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24
Q

Name 5 different chlorophyll pigments

A

Carotene
Phaeophylin
Xanthophyll
Chlorophyll a
Chlorophyll b

25
Q

What conclusion can you make from the ‘investigating photosynthesis pigments’ PAG

A

That plant leaves consist of different types of pigments that utilise various sunlight wavelengths for photosynthesis and TLC was able to separate these different pigments.

26
Q

What does the Calvin Cycle use to convert carbon dioxide into sugars

A

ATP and Reduced NADP

27
Q

In the light dependant reaction, what is the light energy absorbed by photosystem used for

A

-Photphosphorylation (making ATP from ADP and inorganic phosphate)

-Making reduced NADP from NADP

-Splitting water into protons (H+ ions), electrons and oxygen (Photolysis) .

28
Q

What are the two types of phosphorylation

A

Cyclic
Non cyclic
(Both part of the light dependant stage)

29
Q

Non cyclic phosphorylation produces…

A

ATP
Reduced NADP
Oxygen

30
Q

Cyclic phosphorylation produces…

A

Only small amounts ATP

31
Q

Oxidation

A

is lose of hydrogen atoms or electrons

32
Q

Reduction

A

gain of hydrogen atoms or electrons

33
Q

what type of molecule is NAD and NADP

A

coenzymes

34
Q

What are chloroplasts, where are they found and what occurs in them

A

organelles
found in plant cells
photosynthesis occurs

35
Q

What are chloroplast surrounded by

A

double membrane envelope, each a phospholipid bilayer

36
Q

The outer membrane of chloroplast is permeable to what

A

range of ions and small molecules

37
Q

the inner membrane contains what, allows what kind of substances through

A

contains transport proteins,
allows certain mol/ ions to enter and leave

38
Q

What is the chloroplast filled with

A

Cytosol-like fluid (stroma)
CO2, sugars, enzymes and other mols dissolved in it

39
Q

Membrane system in the stroma

A

Series flattened fluid-filled sacs, known as thylakoids

40
Q

Structure of thylakoids
And what do they contain

A

Series flattened fluid-filled sacs, containing pigments, enzymes and election carriers

41
Q

How are grana formed

A

Thylakoids stack up

42
Q

How are grana connected

A

By membrane channels known as lamellae

43
Q

What do the lamellae ensure

A

Ensures the stacks of sacs are connected, but distanced from each other

44
Q

What does the membrane of a grana create

A

Large SA to Vol ratio

45
Q

What does the membrane system of chloroplast provide

A

Large number of pigments mols, ensures as much light as possible absorbed. Pigment mols arranged in light-harvesting clusters, known as photosystems

46
Q

What makes up a photosystem

A

Different pigment mol, arranged funnel-like structures in thylakoid membrane.

Each pigment mol passes energy down to the next, eventually reaching primary pigment reaction centre.

47
Q

What does the stroma contain

A

-Small ribosomes

-A loop of DNA (codes for chloroplast proteins, that are produced at the 70S ribosomes)

-Starch grains

48
Q

What are the sugars formed during photosynthesis stored as

A

Starch

49
Q

Where are the sugars formed during photosynthesis stored

A

Inside starch grains

50
Q

What are the 2 classification of pigments

A

Primary and Accessory pigments

51
Q

What surrounds the primary pigments molecules

A

Several hundred accessory pigments

52
Q

How does the light energy reach the reaction centre

A

Light energy is absorbed by accessory that pass/ channel down the energy to the primary pigment mol.
The primary pigment mol act as a reaction centre

53
Q

Photosystem 1

A

-Photosystem arranged around mol of chlorophyll a

-Peak absorption 700nm

-Reaction centre known as P700

54
Q

Photosystem 2

A

-Arranged around mol chlorophyll a

-Peak absorbtion 680nm

-Reaction centre known as P680

55
Q

Equation for Photolysis

A

2H2O —(light)—-> O2 + 4H+ + 4e-

56
Q

Role of water in photolysis

A

Water requires 4 photons of light, energy equivalent to split one H2O

The O2 produced diffuses out chloroplast and eventually into air

57
Q

How is reduced NADP formed

A

H+ ions combine with electrons from PS1 and NADP to give reduced NADP

58
Q

When does photolysis of light occur

A

During non-cyclic phosphorylation

59
Q

What does PS2 have for the photolysis of light (makes it possible)

A

Water splitting enzymes which catalyses the breakdown of water into H+ ions, O2 and electrons.

Water is the by product
Electeons fill the electron hole in PS2