AP Bio Energetics practice quiz

Which of the following questions can best be answered by the diagram?

"Does the addition of an enzyme reduce the activation energy required for a reaction?"

Which of the following questions is most relevant to understanding the Calvin cycle?

"How is ATP used in the formation of 3-carbon carbohydrates?"

The energy required to run the Calvin cycle reactions of photosynthesis comes from which two substances produced during the light-dependent reactions?

ATP and NADPH

Butterflies of the genus Colias live in the Rocky Mountains, where they experience a wide range of temperatures. Different variants of a particular glycolytic enzyme in the flight muscles are optimally active at different temperatures. Within the same population, some individual butterflies fly most effectively at 29°C , while others fly most effectively at 40°C. Still others can be equally active at both temperatures. Which of the following claims is most consistent with the observed butterfly behavior?

Butterflies that express two variants of the enzyme are active over a greater range of temperature.

An increase in the rate of oxygen production by algae would be accompanied by a comparable increase in the rate of production of which of the following substances?

CO2

Process in which carbon from CO2 is incorporated into organic molecules...

Calvin cycle (light-independent reactions of photosynthesis)

Process found in both photosynthesis and cellular respiration...

Chemiosmosis

If the input water is labeled with a radioactive isotope of oxygen, 18O, then the oxygen gas released as the reaction proceeds is also labeled with 18O. Which of the following is the most likely explanation?

During the Calvin cycle, water is split, regenerating NADPH from NADP+, and oxygen gas is released.

Process in which sugar is oxidized to pyruvic acid...

Glycolysis

The O2 released during photosynthesis comes from where?

H20 (water)

Process in which CO2, is released as a by-product of oxidation-reduction reactions...

Krebs cycle (citric acid cycle)

Process in which O2 is released as a by-product of oxidation-reduction reactions...

Light-dependent reactions of photosynthesis

An intermediate electron acceptor for oxidations that occur in both glycolysis and in Krebs cycle reactions is...?

NAD+

Based on the data shown, changes in the light intensity resulted in changes in the rate of which of the following processes?

Photosynthesis

What most likely causes the trends in oxygen concentration shown in the graph above? (Shows decreased [oxygen] @ night)

Photosynthesis produces more oxygen than is consumed by respiration during the day.

Which of the following experimental designs should the students use as a control for the experiment? (potato and filter paper and catalase lab)

Place a catalase-soaked disk in a beaker of water.

Which of the following can be used to determine the rate of enzyme-catalyzed reactions?

Rate of disappearance of the substrate

Which of the following best describes why the disks rose to the surface faster in the more concentrated hydrogen peroxide solutions? (potato and filter paper and catalase lab)

The higher substrate concentrations in the more concentrated solutions speeded the reaction.

Which of the following is an important difference between light-dependent and light-independent reactions of photosynthesis?

The light-dependent reactions produce ATP and NADPH; the light-independent reactions use energy stored in ATP and NADPH.

Which of the following statements is true about the Krebs (citric acid) cycle and the Calvin (light-independent) cycle?

They both are carried out by enzymes located within an organelle matrix.

Which of the following best describes why ice was used during this experiment? (potato and filter paper and catalase lab)

To increase the activity of the enzyme

The carbon 'that makes up organic molecules in plants is derived directly from where?

carbon (CO2) fixed in photosynthesis

According to the results of this experiment, germination of tobacco seeds during the first week is...?

increased by exposure to light

ATP serves as a common energy source for organisms because...?

its energy can be easily transferred to do cellular work

If the potato solution was boiled for 10 minutes and cooled for 10 minutes before being tested, the average time for the disks to float to the surface of the hydrogen peroxide solution would be...? (potato and filter paper and catalase lab)

more than 30 seconds

Carbohydrate-synthesizing reactions of photosynthesis directly require...

products of the light reactions

Additional observations were made on day 21, and no yellow-leaved seedlings were found alive in either dish. This is most likely because...

yellow-leaved seedlings were unable to convert light energy to chemical energy