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:

Coin Flip

A method of making a binary decision or selecting randomly between two options using the outcome of a tossed coin.

Base Rate Fallacy

A cognitive error where individuals ignore general statistical information (base rates) in favor of specific anecdotal information.

Representativeness Heuristic

A mental shortcut used to make decisions or judgments by comparing information to our mental prototypes and stereotypes.

Anchoring and Adjustment Heuristic

A cognitive bias where an individual relies too heavily on an initial piece of information (anchor) when making decisions, with insufficient adjustments made thereafter.