Predict how the following conditions would affect the production of O₂, ATP, and NADPH and state whether noncyclic or cyclic electron flow would occur in each:
(2) blue and red photons hit a chloroplast, but no NADP⁺ is available

Which of the following is a false statement about photosynthesis?

a. During the light-independent reactions, electrons and ATP from the light reactions combine with atmospheric carbon dioxide to produce sugars.

b. The light-independent reactions take place in the chloroplast stroma.

c. Oxygen produced during the light-independent reactions is released into the atmosphere.

d. Chlorophyll absorbs blue and red light and reflects green light.

e. The end product of photosynthesis is a carbohydrate such as glucose.

Which process is most directly driven by light energy?

a. Creation of a pH gradient by pumping protons across the thylakoid membrane

b. Reduction of NADP⁺ molecules

c. Transfer of energy from pigment molecule to pigment molecule

d. ATP synthesis

Which of the following correctly identify a role of the ATP produced in the light-capturing reactions? Select True or False for each statement.

T/F It is used by rubisco to fix CO₂ to RuBP.

T/F It serves the same role as ATP produced by mitochondria.

T/F It is used to regenerate RuBP from G3P molecules.

T/F It is used to produce G3P molecules

Predict how the following conditions would affect the production of O₂, ATP, and NADPH and state whether noncyclic or cyclic electron flow would occur in each:

(3) blue and red photons hit a chloroplast, but a proton channel has been introduced into the thylakoid membrane, so it is fully permeable to protons.

Predict how the following conditions would affect the production of O₂, ATP, and NADPH and state whether noncyclic or cyclic electron flow would occur in each:

(1) Only blue photons hit a chloroplast

An investigator exposes chloroplasts to 700-nm photons and observes low O₂ production, but high ATP production. Which of the following best explains this observation?

a. The electrons from water are directly transferred to NADP⁺, which is used to generate ATP.

b. Photosystem II is not splitting water, and the ATP is being produced by cycling electrons via photosystem I.

c. The O₂ is being converted to water as a terminal electron acceptor in the production of ATP.

d. Electron transport has stopped and ATP is being produced by the Calvin cycle.