1:the purpose of calvin cycle is to : A: generate the O2 gas required for cellul

Question

1:the purpose of calvin cycle is to :

A: generate the O2 gas required for cellular respirtion

B: recover electrons lost when water was split

C: convert inorganic carbon into usable form of carbon

D: capture photons of light to harvest solar energy

E: counteract increasing atmospheric CO2 concentrations ( global warming).

2: which products of the calvin cycle are used in light reaction

A: protons and P1

B:) O2, water and ATP

C: ADP, P1, and NADP+

D: G3P. ATP, and NADPH

E: electrons from CO2

3: Why is photorespiration more likely to occur during warm weather?

?A: Plants use up the water in their central vacuoles in warm weather, inhibiting the water-requiring light reactions; this in turn alters the activity of rubisco.

B: ?Plants require warm weather (at least 23°C) to drive photosynthesis.

C: Plants are more likely to dehydrate in warm weather, forcing them to close the stomata to conserve water, thus preventing CO2 from entering the leaf.?

D: The rubisco enzyme is very temperature sensitive and becomes less efficient in warmer temperatures, allowing it to fix O2 instead of CO2

E: Plants are more likely to close their stomata in the nighttime than during the day.?

4: Rubisco has 16 subunits joined together to make a functional unit. Eight of the subunits are large, the other 8 are small. On which subunit(s) is/are the active sites located?

?A; on one of the 8 large subunits

B: on each of the 16 subunits

C: on each of the 8 large subunits

D: on each of the 8 small subunits

E: on one of the 8 smallest subunits

5: Which characteristic of the light absorbing regions of chlorophylls and carotenoids most likely accounts for the ability of these molecules to absorb light?

?A: long hydrocarbon chain?

B: the presence of aldehyde side groups

C; the presence of magnesium

D: an extensive network of double bonds?

E: ringed structures

6: In the C4 pathway, which molecule is formed after the addition of CO2 to PEP??

A: 3PGA?

B: oxaloacetate?

C: ?phosphoenolpyruvate

D: Malate

E: pyruvate

7: When a photon of light is absorbed by a pigment molecule, electrons jump to an excited state. What is one possible fate of these excited electrons?

?A: the excited electrons are transferred to an electron donor molecule?

B: the excited electrons jump to a lower energy level, releasing energy to a nearby pigment molecule

C: the excited electron jump to a lower energy level, releasing energy in the form of ATP

D: the excited electron release energy in the form of a photon

E: the excited electron revert back to their ground state without releasing any energy

8: Rubisco has 16 subunits joined together to make a functional unit. Eight of the subunits are large, the other 8 are small. On which subunit(s) is/are the active sites located??

A: on one of the 8 large subunits

B: on one of the 8 small subunits

C: on each of the 16 subunits

D: on each of the 8 small subunits

E: on each of the 8 large subunits

Explanation / Answer

Answer:

5. an extensive network of double bonds is the characteristic of the light absorbing regions of chlorophylls and carotenoids most likely accounts for the ability of these molecules to absorb light.

6. oxaloacetate

7. the excited electrons jump to a lower energy level, releasing energy to a nearby pigment molecule

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