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.4 > BIO TEST 4 - LECTURE 6 STUDY GUIDE > Flashcards

BIO TEST 4 - LECTURE 6 STUDY GUIDE Flashcards

1
Q
  1. Which statement does not describe a step of the light-dependent reactions completed during photosynthesis? (know the information in the diagram we discussed on chapter eight slide eighteen)
A

absorbing energy from the light (main wavelengths are in the 680 nm range or chlorophyll a)
sending it from the antenna complex to the reaction center

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2
Q
  1. What occurs within Photosystem II during the light-dependent reactions completed during photosynthesis?
A

diffusion, no energy is being used to create energy, it’s all a natural flow.

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3
Q
  1. What is the function of Plastoquinone (PQ) during the light-dependent reactions completed during photosynthesis?
A

An electrical energy carrier, from Photosystem II to B6-f complex

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4
Q
  1. What is the function of the B6-F complex during the light-dependent reactions completed during photosynthesis?
A

proton pump that’ll pump all the proteins across to keep concentration high in thylakoids space

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5
Q
  1. What is the function of Plastocyanin (pC) during the light-dependent reactions completed during photosynthesis?
A

Carrying a low charged electron amount from the proton pump to photosystem I to be charged again. Smallest amount of charge and has some copper elements (conductor) which can then recharge inside next photosystem

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6
Q
  1. What occurs within Photosystem I during the light-dependent reactions completed during photosynthesis?
A

Recharging and pumping out electrical charge to the power chain.

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7
Q
  1. What is the function of Ferredoxin (Fd) during the light-dependent reactions completed during photosynthesis?
A

It’s a carrier that carries energy to the NADP reductase. Highly charged, so high amount of energy.

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8
Q
  1. What is the function of NADP reductase during the light-dependent reactions completed during photosynthesis?
A

the last enzyme used, to get the energy there you are using ferredoxin. NAD+ to NADPH. You need the NADPH to do the light independent reaction.

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9
Q
  1. How is the ATP synthase powered at the end of the light-dependent reactions completed during photosynthesis?
A

Creating ATP from ADP. Ran by the proton gradient.

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10
Q
  1. The Calvin cycle (the light independent reactions) takes place at the end of photosynthesis. Which statement describes the first steps of the Calvin cycle discussed during class?
A

Carbon Fixation: Apart from being a 6 carbon molecule, it’ll have a tendency to break up .
Phosphoglycerate (6 carbon + ATP) → 3 phosphate Glyceraldehyde

Equation: 5+1=6, divided by 2 cause it’s not stable together

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11
Q
  1. The Calvin cycle (the light independent reactions) takes place at the end of photosynthesis. Which statement describes the second steps of the Calvin cycle discussed during class?
A

One uses energy and NADPH, to then go and create a Glyceraldehyde 3-phosphate hydrogen gets added

Remember: 3 to 3, no real change unless structure is broken

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12
Q
  1. The Calvin cycle (the light independent reactions) takes place at the end of photosynthesis. Which statement describes the third steps of the Calvin cycle discussed during class?
A

Regeneration of RuBP: Adding atp and taking some phosphates off, using energy to go and create RuBP, left with 5 carbon
3 carbon + some energy = RuBP

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13
Q
  1. The Calvin cycle (the light independent reactions) takes place at the end of What is the net equation of the Calvin cycle photosynthesis. (know the reactants and products discussed in class)
A

6CO2+18 ATP+12 NADPH +H2O → 2 Glyceraldehyde 3 - Phosphate + 16Pi + 18 ADP +12 NAD+

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14
Q
  1. What is the definition of photorespiration?
A

When a plant can’t properly create glucose molecules

Large amount of build up of oxygen inside the stroma, too much oxygen instead of CO2

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15
Q
  1. What steps (what conditions) can lead to photorespiration occurring within a plant cell?
A

Too much oxygen build up when the stomata closes

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16
Q
  1. _______________ (percent) of photosynthetically fixed carbon is lost to photorespiration (if at 25°C). Fill in the blanks.
A

20%

17
Q
  1. Plants can use two other forms of photosynthesis (other than C3) to live under environmentally stressed conditions called ______________ and ____________. Fill in the blanks.
A
  1. CAM
  2. C4
18
Q
  1. According to the video Photorespiration, plants in hot, dry environments lose a significant amount of water through their _____________. Fill in the blank.
A

Stomata

19
Q
  1. According to the video Photorespiration, how do plants avoid water loss?
A

Rubisco in the stroma will attach oxygen instead of carbon dioxide

20
Q

According to the video Photorespiration, why is photorespiration a bad thing for plant cells?

A

The process cannot continue (phosphoglycolate releases its carbon and the carbon dioxide is essentially wasted)
Insufficient carbon in the calvin cycle stops G3P from being produced (precursor of glucose)

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