Exam #2 Higher Plants

A plant that opens its stomata only at night is

CAM plant

How does an enzyme affect the energy of a reaction

the activation energy is lowered

Which of the following represents the correct flow of electrons during photosynthesis?

H2O- NADPH- Calvin Cycle

Photosynthesis is an example of an _______ chemical reaction because ______

endergonic, light energy is used ot build up chemical bonds

The evolution of photosynthesis resulted in

an increase in the amount of O2 in the atmosphere

Why is chlorophyll green?

It absorbs wavelengths in the blue and red parts of the visible spectrum

The light reactions supply the Calvin cycle with

ATP and NADPH

What is metabolism?

sum total of chemical reactions in an organism, especially related to the breaking down of food for energy

Which of the following best describers the role of antenna pigments in photosynthesis?

they absorb light energy and transfer it to the reaction center chlorophyll

Which of the following occurs during the Calvin cycle?

carbon fixation

What two main products result from photosynthesis?

sugar/carbohydrates and oxygen

What is the ratio of Photosystem I to Photosystem II and why?

There is more PS II than PS I because splitting water is difficult and therefore is the rate limiting step

Building protein ______ energy, ATP hydrolysis _______ energy

requires, releases

Photorespiration becomes more likely when:

stomata remain closed in C3 plants

In which compartment of the plant cell do the light-independent reactions of photosynthesis take place?

stroma

Where does the energy come from to drive photosynthesis?

The sun

Which of the following is the best example of potential energy in a cell?

a molecules of glucose

In mechanism, photophosphorylation is most similar to

oxidative phosphorylation in cellular respiration