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12 Dec 2019

Which statement is NOT true about photosystems?

a. Photosystem I passes electrons on to Photosystem II

b. Photosystem I contains a reaction center molecule that loses electrons which are then replaced by electrons from water.

c. Each photosystem contains numerious pigment molecules that act as antennas to capture light.

d. electrons in the reaction center molecule are excited by absorbed solar energy and are passed along to an acceptor molecule.

e. only photosystem I is involved in the cyclic electron pathway

ab. A & B only

bc. B & C only

cd. C & D only

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Related questions

Photosynthesis

Light Reactions:

Photosynthesis is the process of reducing/oxidizing (circle one) _____________________ to produce ___________________. This overall reduction-oxidation reaction requires _________________ to begin the flow of __________________. Photosynthetic ____________________ absorb light energy and are located in ___________________ found embedded within the membranes of __________________. The most prevalent one include the ___________________ which reflect ________________ light and absorb the other wavelengths of light. Accessory pigments include ___________________. When light energy is absorbed in photosynthesis, electrons of pigment molecules become _________________ and move into higher potential energy _______________. When the electrons return to their previous position, _____________ is passed to the ______________________ pigment molecule. Electrons within this pigment molecule move to a high potential energy state and are Γ’Β€ΒœgrabbedҀ by _________________________ chains. Electrons from photosystem II are passed to ______________________. Electrons from photosystem I are passed to _________________. As electrons move in the electron transport chain associated with photosystem I/II (circle one), the energy released is used to power ___________ pumps and __________ is produced via a process known as ________________________. Photosystem I/II (circle one) electrons must be replaced to continue the reaction so ____________ is split for its electrons. The products _______________ & _______________ then proceed to the ______________________ cycle.

Calvin Cycle:

The Calvin Cycle can be broken into 3 main series of reactions. In the first group, known as the __________________ step, ______________________ combines with 3 molecules of ____________________ to form 6 molecules of _____________________. This reaction is catalyzed by ___________________. ________________ can act as a competitive inhibitor of this enzyme, shutting down this step in a process known as ______________________________. In the second series of reactions known as the __________________ steps, the molecules produced in the previous step get oxidized/reduced (circle one). The source of electrons is _________from the light reactions. This step is endergonic/exergonic (circle one) and thus requires _______ from the light reactions. Six molecules of _____________________ are produced, ______ (#) of which will continue in biosynthetic pathways to produce __________________. The remaining molecules will then enter the ______________________ steps which require _____________ from the light reaction. In this step, 3 molecules of _______________ are produced so that this cyclic reaction can continue.

In a thylakoid membrane, absorbed light energy is passed from one chlorophyll molecule to another until it is:

Select one:

a. dissipated as heat.

b. released as fluorescence

c. passed to a reaction center.

Question 2

Protons in a chloroplast flow through an ATP synthase from the:

Select one:

a. cytoplasm to the intermembrane space.

b. stroma to the intermembrane space.

c. thylakoid lumen to the stroma.

d. stroma to the thylakoid lumen.

e. intermembrane space to the stroma.

Question 3

Which of the following are produced directly as a result of the movement of electrons through the photosynthetic electron transport chain?

Select one:

a. oxygen and carbohydrates

b. carbohydrates and ATP

c. ATP and NADPH

d. water and carbohydrates

Question 4

If a mutation occurs such that photosystem II no longer functions as efficiently as it should, what might be most directly affected?

Select one:

a. The amount of H2O produced.

b. The rate at which NADPH is produced.

c. The rate at which protons are transported into the stroma.

d. The rate of ATP synthesis by ATP synthase in the chloroplast.

Phototrophs need an electron source like H2S orH2O. Where do the electrons from these sources go?(Assume the organism is growing autotrophically as well astophototrophically.)

O2 and CO2

O2 only

CO2 only
Sulfate or oxygen
Inorganic various molecules, depending on cellular needs.
2. Which of the following statements about chlorophyll istrue?
It is a good electron acceptor in its oxidized form.
It is a good electron donor in its reduced form when energizedby light.
It contains magnesium.
It is a tetrapyrrole.
All of the above
3. The unifying feature of all photosynthetic organisms isa(n)
electron transfer chain.
electron donating system to generate NADPH.
ATP-generating system.
light-gathering system.
All of the above
4. Evidence suggests that banded iron formations are due to
chemical oxidation of reduced iron, Fe2+.
aerobic reduction of insoluble ferric iron, Fe(OH)3.
anaerobic oxidation of soluble ferrous iron,Fe2+.
Both a and b
Both a and c
5. In addition to their ability to harvest light in the 400 to 500nm range, carotenoids also
eject electrons from the reaction center.
function as a tetrapyrrole.
intercept toxic single-state oxygen.
transfer electrons to ubiquinone.
raise electrons to a higher energy state.
6. Ribosomal RNA and other cell features affirm that living cellsshould be divided into three groups called domains.
True
False
7. Microbes have started to evolve recently.
True
False
8. The ________ was essential for the evolution of oxygenicphotosynthesis.
evolution of cyanobacteria
development of photosystem I
ability to extract electrons from CO2
ability to extract electrons from H2O
ability to use oxygen as the terminal electron acceptor
9. What do oxygenic phototrophs use as an electron source?
Oxygen
Sulfide
Water
Organic compounds
CO2
10. Three domains of organisms have been established basedprimarily on size and other structural features of the cells.
True
False

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