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BSC 2010 > Chapter 10 HW- Photosynthesis > Flashcards

Chapter 10 HW- Photosynthesis Flashcards

1
Q

The electron acceptor is reduced, acting as an oxidizing agent. True or False

A

True

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2
Q

Describe an Anabolic Pathway

A

Anabolic pathways build molecules, require energy, and are endergonic.

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3
Q

Describe a Catabolic Pathway

A

Catabolic pathways release energy by breaking down complex molecules into simpler compounds. These exergonic reactions proceed with a net release of free energy.

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4
Q

What happens along an electron transport chain?

A

Electrons are passing from a reducing agent, releasing free energy at each step

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5
Q

The ultimate source of energy to support most life on Earth is…

A

Sunlight

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6
Q

Describe the relationship between photosynthesis and cellular respiration

A

Photosynthesis stores energy in complex organic molecules; cellular respiration releases energy from complex organic molecules

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7
Q

In chloroplasts, the photosynthetic electron transport chain acidifies what cellular compartment?

A

Thylakoid space

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8
Q

What is a process most directly driven by light energy?

A

the oxidation of chlorophyll molecules

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9
Q

The photosynthetic membranes are found where in plant cells?

A

Chloroplast

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10
Q

During photosynthesis what molecule is being oxidized and reduced during the Calvin cycle

A

H2O is being oxidized
CO2 is being reduced

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11
Q

Describe the flow of electrons during photosynthesis

A

H2O—-> NADP—-> Calvin Cycle

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12
Q

What is an indicator that a photosynthetic organism lacks photosystem II?

A

It does not produce O2 in the light

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13
Q

What are the products of liner electron flow in the light reactions of photosynthesis?

A

ATP and NADPH

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14
Q

What is a process that would be most directly affected if a thylakoid membrane is punctured so that the interior of the thylakoid is no longer separated from the stroma?

A

The synthesis of ATP

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15
Q

P680+ is said to be the strongest biological oxidizing agent. Why is the strong oxidizing potential of P680+ essential for its function?

A

It obtains electrons from the oxygen atom in a water molecule

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16
Q

What is the basic role of CO2 in photosynthesis?

A

CO2 is fixed or incorporated into organic molecules

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17
Q

Where do light reactions occur?

A

The thylakoids

18
Q

The Calvin cycle occurs in the

A

Stroma

19
Q

What process occurs in the Calvin cycle?

A

The reduction of CO2

20
Q

When light strikes chlorophyll molecules of PS II, they lose electrons, which are ultimately replaced by

A

Electrons released by the splitting of water

21
Q

The electrons removed from the water are transferred where?

A

P680

22
Q

What is the final electron acceptor from photosystem I?

A

NADP+

23
Q

What is the by-product of photosynthesis?

A

Oxygen

24
Q

What reaction uses H2O and produces O2?

A

Light-dependent reactions

25
Q

What is the importance of the light-independent reactions in terms of carbon flow in the biosphere?

A

The light-independent reactions turn CO2, a gas, into usable carbon in the form of sugars.

26
Q

True or false? The light-dependent reactions of photosynthesis use water and produce oxygen.

A

True

27
Q

What is the primary product of photosystem I?

A

NADPH

28
Q

What is the biological significance of the light-independent reactions of photosynthesis?

A

To convert CO2 to sugar

29
Q

Describe the relationship between the light-dependent and light-independent reactions of photosynthesis

A

The light-dependent reactions produce ATP and NADPH, which are then used by the light-independent reactions.

30
Q

Which molecule is regenerated in the regeneration phase of the Calvin cycle?

A

RuBP

31
Q

What is the main product of the Calvin Cycle?

A

G3P

32
Q

What are the two main stages of photosynthesis?

A

The light reactions, which convert light energy into chemical energy.

The Calvin cycle (sometimes called the dark or carbon reactions), which uses the products of the light reactions to produce sugar

33
Q

What are the inputs of the light reactions?

A

Light, Water, ADP, and NADP+

34
Q

What are the outputs of the light reactions?

A

ATP, O2, and NADPH

35
Q

What are the inputs of the Calvin cycle?

A

ATP, NADPH, and CO2

36
Q

What are the outputs of the Calvin cycle?

A

ADP, NADP+, and G3P

37
Q

In the light reactions, light energy is used to oxidize

A

H2O to O2

38
Q

The electrons derived from this oxidation reaction in the light reactions are used to reduce

A

NADP+ to NADPH

39
Q

The Calvin cycle oxidizes the light-reactions product

A

NADPH to NADP+

40
Q

The electrons derived from this oxidation reaction in the Calvin cycle are used to reduce

A

CO2 to G3P

BSC 2010 (5 decks)

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