Exam 10: Photosynthesis: Energy From Sunlight

Refer to the graph below. This graph was generated using data collected over a 24-hour period on the rate of carbon dioxide uptake by a leaf on a living plant.Based on the pattern revealed by the data, it can be concluded that the plant can be classified as a _______ plant.

A group of scientists led by Melvin _______ conducted experiments demonstrating that RuBP is the CO₂ acceptor in the dark reactions of photosynthesis.

The first product of CO₂ fixation in C₄ plants is

Which statement regarding the electron transport chain between photosystem II and photosystem I is true?

Which statement about chlorophyll is false?

The light-independent reactions cannot run without the products of the _______ reactions.

The chemical energy stored from photosynthesis represents _______ percent of the total energy of the sunlight hitting a green leaf.

The enzyme PEP carboxylase

Refer to the table below showing data collected from chloroplasts isolated from spinach leaves.The chloroplasts were incubated with either compound Q or Z, or with no additions in the control.After 30 minutes of incubation, chloroplasts were analyzed for the photosynthetic functions shown in the table. Assume that compounds Q and Z directly affect components involved in the light reactions.What do these data indicate about the relationship between the light reactions and the light-independent reactions?

In noncyclic electron transport, electrons from _______ replenish chlorophyll molecules that have given up electrons.

How many micromoles of 3-phosphoglycerate would be formed by rubisco if 4 M of RuBP were added to the solution in the presence of CO₂ and the absence of O₂?

The carbon-fixation reactions of photosynthesis require more ATP than NADPH.The additional ATP is provided by

The net chemical changes that result from photosynthesis can be summarized in the following balanced chemical equation: 6 CO₂ + 6 H₂O  C₆H₁₂O₆ + 6 O₂ However, this equation can be made more complete by adding the word "energy" to the (left/right) _______ side of the equation to show how energy is involved in this process.

In noncyclic photophosphorylation, oxidized chlorophyll in photosystem I returns to its reduced state by

Refer to the graph below summarizing data collected using rubisco purified from chloroplasts.It shows how the catalytic activity of rubisco changes in response to varying times of incubation, either with an oxidizing agent or with a reducing agent. Thioredoxin is a protein inside the stroma of a chloroplast that can act as an oxidizing or a reducing agent.Thioredoxin is reduced by ferredoxin in photosystem I.Based on this information and the graph, how do you predict thioredoxin will affect rubisco inside cells of a living plant when the plant is moved from the dark into the light?

In the hydrolysis of H₂O to protons and oxygen during photosynthesis, electrons are transferred to P₆₈₀.This reaction is an example of

The first step in noncyclic electron transport includes

Refer to the figure below. In the figure, how should boxes X, Y, and Z be labeled?

A graph that plots the rate at which CO₂ is converted to sugar versus the wavelength of light illuminating a leaf is called

Refer to the figure below. Based on the process shown in the figure, it can be predicted that the pH in the stroma will _______ when a green plant is exposed to light.