Lc. 9 (photosynthesis & metabolic lifestyles) Flashcards
Quizzes & Openstax (24 cards)
Which of the following components is not used by both plants and cyanobacteria to carry out photosynthesis?
a) chloroplasts
b) chlorophyll
c) carbon dioxide
d) water
a) chloroplasts
What two main products result from photosynthesis?
a) oxygen and carbon dioxide
b) chlorophyll and oxygen
c) sugars/carbohydrates and oxygen
d) sugars/carbohydrates and carbon dioxide
c) sugars/carbohydrates and oxygen
In which compartment of the plant cell do the light-independent reactions of photosynthesis take place?
a) thylakoid
b) stroma
c) outer membrane
d) mesophyll
b) stroma
which is the fluid-filled space surrounding the thylakoid membranes within the chloroplast.
Which statement about thylakoids in eukaryotes is not correct?
a) Thylakoids are assembled into stacks.
b) Thylakoids exist as a maze of folded membranes.
c) The space surrounding thylakoids is called stroma.
d) Thylakoids contain chlorophyll.
b) Thylakoids exist as a maze of folded membranes.
This statement is not correct because thylakoids are not a maze of folded membranes. Instead, they are flattened membrane sacs that are stacked together to form structures called grana.
How are the NADPH and G3P molecules made during photosynthesis similar?
a) They are both end products of photosynthesis.
b) They are both substrates for photosynthesis.
c) They are both produced from carbon dioxide.
d) They both store energy in chemical bonds.
d) They both store energy in chemical bonds.
Which of the following structures is not a component of a photosystem?
a) ATP synthase
b) antenna molecule
c) reaction center
d) primary electron acceptor
a) ATP synthase
A photosystem includes the antenna molecules, the reaction center, and the primary electron acceptor, all of which play roles in capturing and transferring light energy.
From which component of the light-dependent reactions does NADPH form most directly?
a) photosystem II
b) photosystem I
c) cytochrome complex
d) ATP synthase
b) photosystem I
Which molecule must enter the Calvin cycle continually for the light-independent reactions to take place?
a) RuBisCO
b) RuBP
c) 3-PGA
d) CO2
d) CO2
Which order of molecular conversions is correct for the Calvin cycle?
a) RuBP + G3P → 3-PGA → sugar
b) RuBisCO → CO2 → RuBP → G3P
c) RuBP + CO2 → [RuBisCO] 3-PGA → G3P
d) CO2 → 3-PGA → RuBP → G3P
c) RuBP + CO2 → [RuBisCO] 3-PGA → G3P
Where in eukaryotic cells does the Calvin cycle take place?
a) thylakoid membrane
b) thylakoid lumen
c) chloroplast stroma
d) granum
c) chloroplast stroma
stroma is the fluid-filled space surrounding the thylakoids, where the light-independent reactions (Calvin cycle) occur
Which statement correctly describes carbon fixation?
a) the conversion of CO2 into an organic compound
b) the use of RuBisCO to form 3-PGA
c) the production of carbohydrate molecules from G3P
d) the formation of RuBP from G3P molecules
e) the use of ATP and NADPH to reduce CO2
a) the conversion of CO2 into an organic compound
where CO2 is incorporated into an organic molecule, specifically RuBP
If four molecules of carbon dioxide enter the Calvin cycle (four “turns” of the cycle), how many G3P molecules are produced and how many are exported?
a) 4 G3P made, 1 G3P exported
b) 4 G3P made, 2 G3P exported
c) 8 G3P made, 1 G3P exported
d) 8 G3P made, 4 G3P exported
c) 8 G3P made, 1 G3P exported
Process of Photosystem I includes:
light absorption
reduction of NADP+
oxidation of electron transport chain
reduction of primary electron acceptor
Process of Photosystem II include:
oxidation of water
reduction of electron transport chain
pumping H+ through membrane to create gradient
What types of cells carry out ATP synthesis by chemiosmosis?
All
In chloroplasts, the photosynthetic electron transport chain acidifies which of the following cellular compartments?
thylakoid space
Which of the following observations would be the best indicator that an photosynthetic organism lacks photosystem II?
It does not produce O2 in the light
If various plant organellar and/or cell membranes are isolated and incubated with a proton gradient across the isolated membrane in the presence of ADP and Pi, which of the following samples are most likely to be able to synthesize ATP?
thylakoid membrane and inner mitochondrial membrane
Plants and photosynthetic bacteria can be classified as
Photoautotrophs
A photoheterotroph can use light for energy, and _________ as their carbon source.
carbohydrate, acetyl CoA, fatty acid
synthesize organic molecules from CO2 (carbon fixation)
chemoautotrophs
Aquire carbon molecules, such as carbohydrates and lipids, synthesized by other organisms
chemoheterotrophs
obtain their energy through from inorganic molecules
chemoheterotrophs and chemoautotrophs
