Question 1

What are the effects of increasing CO₂ concentrations in the atmosphere?

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Question 2

Why is it necessary to shut down the Calvin Cycle in the dark when ATP and NADPH levels fall?

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Question 3

Another investigator labels CO₂ with radiolabeled ¹⁸O.After exposure of a plant adapted to a hot,dry climate to the radiolabeled CO₂,in what molecule does the radiolabeled ¹⁸O appear?

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Question 4

Which type of photophosphorylation predominates under conditions of high NADP⁺ concentration and under conditions of high NADPH and low ATP concentration?

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Question 5

High intensity light has a negative effect on photosynthesis; in fact,too much light can diminish photosynthetic output.This phenomenon is known as _______.

Accepted Answer

Photoinhibition is the phenomenon where high intensity light negatively affects photosynthesis by diminishing photosynthetic output.

Question 6

When a photon of light is absorbed by a molecule,pushing an electron to a higher energy state,it gives off light or fluoresces if the electron drops down to its ground state.Why is the light given off as fluorescence always of longer wavelength than the light absorbed?

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Question 7

What are the major strategies for atmospheric CO₂ mitigation?

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Question 8

How does high intensity light supposedly damage PSII?

Accepted Answer

High intensity light can cause PSII to become overexcited and generate toxic oxygen species, such as singlet oxygen, which can damage the PSII complex.

Question 9

If water is labeled with ¹⁸O,where does the radiolabeled oxygen appear?

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Question 10

Which of the following is not considered to be a contributor to increased global surface temperatures?

Accepted Answer

Carbon sequestration involves removing carbon dioxide from the atmosphere, which would actually decrease global surface temperatures.

Question 11

ATP synthase molecules located in nonappressed regions of the thylakoid membrane,where two membranes of the grana are not in close contact.What is the reason for this orientation?

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Question 12

You are observing an organism.It appears to extract energy stored in inorganic molecules like ammonia,nitrites and hydrogen sulfide; it uses carbon dioxide as its primary carbon source.What kind of organism is it?

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Question 13

The electrons "stored" in the structure of NADPH contain much higher energy than the electrons of water.These NADPH electrons are raised in energy by the transfer of energy from photosynthetic pigments.Why does it take two photochemical events to accomplish this?

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Question 14

What is a reason for having mobile electron carriers in the thylakoid membranes? Does the movement require energy or is it passive?

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Question 15

What part of PSII appears to suffer most of the damage from high intensity light?

Accepted Answer

The D1 polypeptide of PSII is particularly susceptible to damage from high intensity light, which can lead to the inhibition or breakdown of PSII. This can ultimately lead to photoinhibition and oxidative damage to the photosynthetic system.

Question 16

An investigator radioactively labels CO₂ with ¹⁴C.He exposes a plant from a temperate climate to the radiolabeled CO₂.In what molecule does the ¹⁴C first appear to accumulate stably? Where does the ¹⁴C appear in a plant that is well adapted for life in a hot,dry habitat?

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Question 17

How can green light drive any photosynthesis given that chlorophyll,the major photosynthetic pigment,is green?

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Question 18

Which three organelles in a leaf are found closely associated with each other and cooperate with each other in such a way that products of one organelle serve as substrates in another?

Accepted Answer

The three organelles found closely associated with each other in a leaf and cooperating with each other in such a way that products of one organelle serve as substrates in another are mitochondria, chloroplasts, and peroxisomes. Mitochondria produce ATP through cellular respiration which is required by chloroplasts for the process of photosynthesis. Peroxisomes produce and break down hydrogen peroxide, which is used in various metabolic processes in both chloroplasts and mitochondria. Therefore, option D is the correct choice.

Quiz 6: Photosynthesis and the Chloroplast

What are the effects of increasing CO2 concentrations in the atmosphere?