Photosynthesis Challenge Quiz

Which of the following is a false statement about CAM and C4 plants?

• Both types of plants uses PEP carboxylase and Rubisco

• Both types of plants perform the Calvin cycle

• Both types of plants can run the Calvin cycle with closed stomata

• Both types of plants avoid photorespiration

• Both plants open their stomata at night

Which of the following are products of the light reactions of photosynthesis that are utilized in the Calvin cycle?

• CO2 and glucose

• H2O and O2

• ADP, Pi, and NADP+

• electrons and H+

• ATP and NADPH

Where does the Calvin cycle take place?

• stroma of the chloroplast

• thylakoid membrane

• cytoplasm surrounding the chloroplast

• interior of the thylakoid (thylakoid space)

• outer membrane of the chloroplast

When oxygen is released as a result of photosynthesis, it is a direct byproduct of

• reducing NADP+.

• splitting water molecules.

• chemiosmosis.

• the electron transfer system of photosystem I.

• the electron transfer system of photosystem II.

A plant has a unique photosynthetic pigment. The leaves of this plant appear to be reddish yellow. What wavelengths of visible light are being absorbed by this pigment?

• red and yellow

• blue and violet

• green and yellow

• blue, green, and red

• green, blue, and yellow

In the thylakoid membranes, what is the main role of the antenna pigment molecules?

• split water and release oxygen to the reaction-center chlorophyll

• harvest photons and transfer light energy to the reaction-center chlorophyll

• synthesize ATP from ADP and Pi

• transfer electrons to ferredoxin and then NADPH

• concentrate photons within the stroma

Which statement accurately describes an aspect of the functioning of photosystem II?

• Light energy excites electrons in the thylakoid membrane electron transport chain.

• Photons are passed along to a reaction-center chlorophyll.

• The P680 chlorophyll donates a pair of protons to NADP+, which is thus converted to NADPH.

• The electron vacancies in P680+ are filled by electrons derived from water.

• The splitting of water yields molecular carbon dioxide as a by-product.

Which of the following are directly associated with photosystem I?

• harvesting of light energy by ATP

• receiving electrons from the thylakoid membrane electron transport chain

• generation of molecular oxygen

• extraction of hydrogen electrons from the splitting of water

• passing electrons to the thylakoid membrane electron transport chain

Assume a thylakoid is somehow punctured so that the interior of the thylakoid is no longer separated from the stroma. This damage will have the most direct effect on which of the following processes?

• the splitting of water

• the absorption of light energy by chlorophyll

• the flow of electrons from photosystem II to photosystem I

• the synthesis of ATP

• the reduction of NADP+

What does the chemiosmotic process in chloroplasts involve?

• establishment of a proton gradient across the thylakoid membrane

• diffusion of electrons through the thylakoid membrane

• reduction of water to produce ATP energy

• movement of water by osmosis into the thylakoid space from the stroma

• formation of glucose, using carbon dioxide, NADPH, and ATP