If You Add a Compound to Illuminated Chloroplasts That Inhibits

question 41

Multiple Choice

If you add a compound to illuminated chloroplasts that inhibits the NADP⁺ reductase, NADPH generation ceases, as expected.However, ferredoxin does not accumulate in the reduced form because it is able to donate its electrons not only to NADP⁺ (via NADP⁺ reductase) but also back to the cytochrome b₆-f complex.Thus, in the presence of the compound, a "cyclic" form of photosynthesis occurs in which electrons flow in a circle from ferredoxin, to the cytochrome b₆-f complex, to plastocyanin, to photosystem I, to ferredoxin.What will happen if you now also inhibit photosystem II?

• A)Less ATP will be generated per photon absorbed.
• B)ATP synthesis will cease.
• C)Plastoquinone will accumulate in the oxidized form.
• D)Plastocyanin will accumulate in the oxidized form.

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Definitions:

Income Elasticity

A measure of how the demand for a good or service changes in response to a change in consumers' income.

Quantity Demanded

The total amount of a good or service that consumers are willing and able to purchase at a given price in a specified period of time.

Normal Good

A good or service whose consumption increases when income increases and falls when income decreases, price remaining constant.

Elasticity of Demand

A measure of how much the quantity demanded of a good responds to a change in the price of that good, signifying how the demand for a good can stretch or change.