Exam 10: Photosynthesis: Energy From Sunlight

If four molecules of ribulose bisphosphate (RuBP) were added to a solution containing rubisco and CO₂, what would be the products of the reaction?

In the 1930s, researchers worked with green algae to experimentally determine the minimum light exposure in a single flash that produced the maximal oxygen output.When the researchers calculated the amount of chlorophyll present, they found that there were 300 times more chlorophyll molecules present than would be needed to produce this amount of oxygen with a single light flash.How are these observations consistent with the way that scientists today describe the light-harvesting complex in chloroplasts?

The enzyme ATP synthase couples the synthesis of ATP to

In the overall reaction describing photosynthesis, which class of compounds is represented in one of the products?

The final electron acceptor in noncyclic electron transport is _______.

The energy difference between an electron excited by a photon and the electron in its ground state is

Refer to the table below. An entry in this table comparing C₃ and C₄ plants is missing, as shown by the question mark.The best word to fill in this location on the table is _______.

When the ratio of O₂ to CO₂ within their leaves _______, C₃ plants undergo a shift toward more _______ and less _______.

Compared with long-wavelength light, short-wavelength light has

While reading an online resource, a student noticed an error in the paragraph below: In photosynthesis, ATP is generated in the light reactions and used in the light-independent reactions as a reducing agent to reduce carbon dioxide to form carbohydrates, which the plant can use for structure and energy. Which word or phrase could be changed to eliminate the error?

When a suspension of algae is incubated in a flask in the presence of light and CO₂ and then transferred to the dark, the reduction of 3-phosphoglycerate to glyceraldehyde 3-phosphate slows and then stops.This happens because

Photophosphorylation requires

During photophosphorylation, the energy to produce ATP is provided by

In C₄ plants, CO₂ is first fixed to form a compound called

Photosynthetic efficiency is affected by the

Refer to the graph below. The graph shows changes in the quantities of ribulose 1,5-bisphosphate (RuBP) and 3-phosphoglycerate (3PG) in sugar beet leaves over a 14-hour time period from just before dawn to sunset.One hypothesis that could be posed based on these data is that light _______ the enzyme rubisco.

Why are plants green?

What part of the electromagnetic spectrum has more energy than yellow light?

Refer to the graphs below summarizing results from experiments on sugar beet plants grown in an environmental chamber with a 14-hour light/10-hour dark cycle.Pieces of leaves were cut from the plants every hour during the light period and ground up to release their cells' contents.Assays were then done to measure the enzyme activities of three different enzymes that participate in the Calvin cycle.The results were graphed in separate graphs as shown. The enzymes include rubisco, fructose bisphosphatase (FBPase), and phosphoribulokinase (PRK).What do the data indicate about the effect of light on enzymes in the Calvin cycle? Explain why this effect is beneficial to the plant.

A molecule that has an absorption spectrum showing maximum absorption within the wavelengths of visible light is