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Bio 1020 > Ch.9 > Flashcards

Ch.9 Flashcards

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Biology 101 flashcards
1
Q

6H2O + 6CO2 + energy(photons) —–> C6H12O6 + 6O2

What process does the chemical equation describe?

A

Photosynthesis

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2
Q

Where does all the O2 of photosynthesis come from?

A

oxidation of water

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3
Q

In the photosynthesis chemical equation what does CO2 get reduced too?

A

Glucose

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4
Q

What causes algal blooms?

A

nutrients (usually phosphorus)
Temperature

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5
Q

Why can algal blooms be a problem?

A

Production of toxic compounds
Oxygen consumption by algae and bacteria feeding on dead algae

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6
Q

Where does photosynthesis take place in Eukaryotes?

A

Chloroplasts

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7
Q

Where does photosynthesis take place in prokaryotes?

A

Internally folded membrane

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8
Q

TF:
Atoms can absorb the energy of photons

A

T

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9
Q

TF:
Atoms can give off photons

A

T

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10
Q

TF:
Only certain atoms and molecules absorb certain types of photons

A

T

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11
Q

Which molecules absorb the photons?

A

Pigments

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12
Q

What is emitted after an electron leaves the higher energy state and returns to it’s original state?

A

Photon

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13
Q

What is the pigment involved in photosynthesis tha absorbs blue and red light?

A

Chlorophylls

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14
Q

What can absorb photons of wavelenths that chlorophyll can’t and passes the light energy off to chlorophyll?

A

Accessory pigments

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15
Q

Can pigments that chlorophyll can’t absorb be used in photosynthesis?

A

Yes

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16
Q

Two different stages in photosynthesis

A

Light reactions
Dark reactions

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17
Q

Why is the light energy transferred to electrons in light reactions of photosynthesis

A

To be used to make ATP and high energy electron source

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18
Q

What happens in Dark reactions

A

CO2 is reduced to a carbohydrate

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19
Q

What happens once the energy from electrons is directed towards cholorophyll

A

Energy of electrons in chlorophyll is increased and causes them to be lost from the chlorophyll molecule

20
Q

In photosystem II what are the electrons lost from chlorophyll replaced with?

A

electrons from H2O

21
Q

What are electrons passed down?

A

Electron transport chain

22
Q

What happens to the H+ ions

A

Actively transported accross the membrane

23
Q

Where are the H+ ions transported from and to

A

From the Stroma in to the thylacoid compartment

24
Q

TF:
Photosystem II is involved in more than one process

A

F:
Photosystem II is only involved in ATP production

25
Q

How does H+ pass back in to the stoma in Photosystem II?

A

ATP synthase

26
Q

What happens to the electrons at the end of the electron transport chain of Photosystem II?

A

They are passed on to Photosystem I

27
Q

What are the two paths that excited electrons can take?

A

Cyclic
Non cyclic

28
Q

What happens to an electron that takes the cyclic path in Photosystem I

A

They travel through an electron transport chain back to photosystem I

29
Q

What does the cyclic path produce?

A

ATP

30
Q

What process does the cyclic path use to create ATP

A

Chemiosmosis

31
Q

What happens to electrons in the Non cyclic path?

A

They are passed to an electron carrier

32
Q

What is the electron carrier used in the non cyclic path?

A

NADP+

33
Q

What are the 3 phases of the Dark Reactions

A

Carbon fixation
Reduction
Regeneration

34
Q

What does carbon combine with in the carbon fixation phase?

A

5 Carbon sugar

35
Q

What happens once carbon has attached itself to the sugar molecule?

A

It splits in to 2 molecules

36
Q

In the reduction phase what are donated to 3 Carbon molecules and what donates them?

A

Electrons are donated from NADPH

37
Q

In the reduction phase, what happens to one of the 3 carbon products?

A

Used to produce glucose

38
Q

In the Regeneration phase, what happens to one of the 3 carbon compounds? And does it require energy? if so, what is the name of the energy required?

A

It is used to make a new RuBP, it requires ATP

39
Q

What is the name of the Balance between light and dark reactions?

A

Photostasis

40
Q

TF:
Organisms build photosynthetic systems to balance light and dark reactions

A

True

41
Q

What happens to reaction centers in photostasis if they remain reduced?

A

They will be damaged

42
Q

What reactions are temperature sensitive?

A

Dark reactions

43
Q

What two measures can be taken to compensate for a change in temperature?

A

Change in pigment
Reduce their chlorophyll levels

44
Q

What happens to plants when they take in CO2?

A

lose water

45
Q

What part of the plant regulates gas exchange in leaves?

A

Stomata

46
Q

TF:
The stomata prevents water loss

A

True

Bio 1020 (14 decks)

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