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Wrong Exam Qs > photosynthesis☀️🪴 > Flashcards

photosynthesis☀️🪴 Flashcards

1
Q

how are grana adapted for their function

A
  • contain ETC/ ATP synthase

- large SA for light absorption

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2
Q

where in chloroplast is the metabolic pathway involving co2

A

stroma

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3
Q

why is the theoretical rate of photosynthesis not achieved as light intensity increases

A
  • temperature is a limiting factor as the calvin cycle relies on enzymes
  • co2 is a limiting factor as it is required for calvin cycle
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4
Q

how are plants adapted to live in shade

A
  • more chloroplasts
  • more grana
  • larger leaf SA
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5
Q

how are heterotrophs reliant on plants

A
  • heterotrophs have to eat plants for glucose
  • autotrophs produce glucose and oxygen by photoaynthesis
  • heterotrophs need oxygen for respiration
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6
Q

name an accessory pigment

A
  • carotene

- chlorophyll b

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7
Q

what is the first stable product of carbon dioxide fixation

A

glycerate 3 phosphate

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8
Q

what is the compound regenerated in the calvin cycle so more co2 can be fixed

A

RuBP

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9
Q

name a compound that can be formed from TP but not as a part of the calvin cycle

A

amino acid

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10
Q

what is an autotroph

A

can make organic molecules from inorganic molecules

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11
Q

what is a heterotroph

A

relies on organic molecules produced by another organism

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12
Q

what are fat droplets in the chloroplast for

A
  • membrane formation

- fatty acid synthesis

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13
Q

how is light harvested in chloroplast membranes

A
  • pigments form antenna complex
  • photon absorbed by pigment
  • electron excited and returned to pigment
  • photon passed from one pigment to another
  • photon passed to reaction centre
  • range of accessory pigments allow range of wavelengths to be absorbed
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14
Q

effect of blocking movement of electrons between electron carriers on photosynthesis

A
  • prevents non cyclic photophosphorylation
  • no electrons available to form NADPH
  • less ATP and NADP for calvin cycle
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15
Q

problems with using o2 production/ co2 uptake to measure photosynthesis rate

A
  • oxygen only produced in one stage
  • oxygen produced may be used for respiration
  • carbon dioxide only used in one stage
  • carbon dioxide uptaken may be used for photosynthesis
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16
Q

how does a chemical that binds to electrons in photosystem i lead to death of plant

A
  • prevents cyclic and non cyclic photophosphorylation
  • less NADPH for calvin cycle
  • no glucose made for respiration
17
Q

final electron acceptor in light dependent stage of photosynthesis

A

NADP

18
Q

how many carbons does RuBP contain

A

5

19
Q

what does rubisco do

A

converts RuBP to 6 carbon compound

20
Q

when is CO2 used in the calvin cycle

A

-one CO2 fixed to RuBP to form 6C compound

21
Q

when is ATP used in the calvin cycle

A
  • 2 ATP used to convert 2GP into 2TP

- 1ATP used to convert 2 TP into RuBP

22
Q

when is NADPH used in the calvin cycle

A

2 NADPH used to convert 2GP to 2TP

23
Q

where is PSII located

A

beginning of ETC

24
Q

where is PSI located

A

middle of ETC

25
Q

which photosystem(s) does cyclic photophosphorylation use

A

PSI only

26
Q

describe cyclic photophosphorylation

A
  • light absorbed by PSI and passed onto pigment
  • electron in pigment is excited to higher energy level
  • electron goes down ETC and then back to PSI
  • this provides energy for proton pump
  • ATP produced by chemiosmosis
27
Q

describe non cyclic photophosphorylation

A
  • light absorbed by PSII and passed to pigment
  • electrons excited to higher energy level then ETC
  • electrons passed to PSI
  • ATP produced by chemiosmosis
  • photolysis, electrons from water go to PSII
  • electrons from PSI go to ETC
  • electrons combine with H+ and NADP to form NADPH
28
Q

where is photolysis

A
  • PSII

- thylakoid lumen

29
Q

products of photolysis

A
  • proton
  • electron
  • oxygen
30
Q

where are protons pumped from and to in the light dependent stage

A

from stroma to thylakoid lumen

31
Q

when is NADPH produced

A

during non cyclic photophosphorylation

Wrong Exam Qs (41 decks)

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