Deck 8: Photosynthesis

Question 1

The primary source of energy for most organisms is ultimately derived from

A) glucose.
B) glycogen.
C) plants.
D) the sun.
E) catabolism.

Answer 1

the sun.

Question 2

Which of the following type of organism is most likely an autotroph?

A) caribou
B) lion
C) human
D) tree
E) parasite

Answer 2

tree

Question 3

________ consume organic molecules to live.

A) Photoautotrophs
B) Autotrophs
C) Hemitrophs
D) Heterotrophs
E) Plants

Answer 3

Heterotrophs

Question 4

Which of the following organisms produce organic matter from inorganic molecules?

A) photosynthetic bacteria
B) plants
C) algae
D) autotrophs
E) All of the choices are correct.

Question 5

The equation, 6CO₂+ 6H₂O ?C₆H₁₂O₆ + 6O₂, describes a reaction that

A) is exergonic.
B) yields energy.
C) occurs in animals only.
D) is catabolic.
E) is anabolic.

Question 6

Which of the following statements would be most INCORRECT if there were a sudden decline in plants on Earth?

A) Oxygen levels in the environment might decline.
B) The rate of photosynthesis in existing plants would decline.
C) There would be less organic matter on Earth.
D) A decline in the population of herbivores would likely occur.
E) Heterotrophic organisms would be significantly impacted.

Question 7

Which of the following is NOT a product of the light reaction?

A) NADPH
B) ATP
C) oxygen
D) carbon dioxide
E) energy intermediates

Question 8

Among the different forms of electromagnetic radiation emitted by the sun, which form is visible?

A) ultraviolet
B) gamma rays
C) light
D) microwaves
E) infrared

Question 9

Which of the following statements about chlorophyll is correct?

A) It appears green because it absorbs light in the green light spectrum.
B) It reflects all colors in the light spectrum except green.
C) It reflects light in the green light spectrum.
D) It reflects high-energy electrons.
E) All of the choices are correct.

Question 10

Which of the following is mismatched with its location?

A) light reaction; grana
B) electron transport; thylakoid membrane
C) Calvin cycle; stroma
D) ATP synthase; intermembrane space
E) splitting of water; thylakoid space

Question 11

During the light reaction water is oxidized to form oxygen. This process

A) yields low-energy electrons.
B) yields high-energy electrons.
C) is needed to replace the electron lost by P680 during the light reaction.
D) yields low-energy electrons and is needed to replace the electron lost by P680 during the light reaction.
E) yields high-energy electrons and is needed to replace the electron lost by P680 during the light reaction.

Question 12

Which of the following is FALSE when comparing the mitochondria and chloroplast?

A) Both have similar electron transport protein complexes whose structures have been well conserved.
B) Both contain ATP synthase.
C) Both generate ATP via a H+ electrochemical gradient.
D) The inner-membrane space of the mitochondria is similar to that of the thylakoid space insofar as each has a higher H+ concentration relative to that of the mitochondrial matrix and chloroplast stroma.
E) The stroma of chloroplasts is similar to that of the mitochondrial inner-membrane space insofar as each has a higher H+ concentration relative to that of the chloroplast thylakoid lumen and the mitochondrial matrix.

Question 13

During noncyclic electron flow of the light reaction, which molecule is the final acceptor of the high-energy electron?

A) oxygen
B) P700
C) NADP+
D) P680
E) ATP synthase

Question 14

In photosynthesis, which of the following is LEAST involved in the production of ATP?

A) light
B) redox reactions
C) electrochemical H+ gradient across the thylakoid membrane
D) ATP synthase
E) NADP reductase

Question 15

During photosynthesis, the energy given up by electrons as they move through the electron transport chain is used to

A) produce glucose.
B) fix CO₂.
C) generate an electrochemical H+ gradient across a membrane.
D) oxidize water.
E) boost energy levels of pigment electrons.

Question 16

Which portion of the photosynthetic apparatus is involved in the oxidation or splitting of water?

A) reaction center
B) antenna complex
C) P680 chlorophyll
D) manganese cluster
E) light-harvesting complex

Question 17

Which of the following statements regarding photosystem II is FALSE?

A) Photosystem II encompasses a series of redox reactions.
B) Photosystem II contains a chlorophyll molecule that absorbs light at 680 nm.
C) Photosystem II strips an electron from water for direct transfer to the electron transport chain.
D) Photosystem II oxidizes water to form oxygen.
E) Photosystem II contains a series of pigments where energy is transferred by resonance energy transfer.

Question 18

Which of the following contributes to the electrochemical gradient that exists across the thylakoid membrane during photosynthesis?

A) The electron transport chain.
B) The splitting of water to produce H+ and oxygen in the thylakoid lumen.
C) The depletion of H+ in the stroma during NADPH production.
D) The pumping of H+ into the thylakoid lumen by electron transport proteins.
E) All of the choices are correct.

Question 19

Which of the following best represents the path of electron flow that occurs during photosynthesis?

A) H₂O?P680?Final Electron Acceptor?Electron transport chain?P700
B) H₂O?P680?Final Electron Acceptor?P700?Electron transport chain
C) P680?H₂O?Final Electron Acceptor?P700?Electron transport chain
D) P680?Final Electron Acceptor?H₂O?Electron transport chain?P700
E) P680? Electron transport chain?Final Electron Acceptor?H₂O?P700

Question 20

What are the primary functions of both photosystems I and II?

A) produce ATP and NADP+
B) produce CO₂ and ATP
C) produce ATP and NADPH
D) produce O₂, ATP, and NADP+
E) produce O₂, ATP, and NADPH

Question 21

Which order of events for the Calvin cycle is correct?
I. Reduction
II. Regeneration of the CO₂ acceptor (RuBP)
III. Carbon fixation

A) I, II, III
B) III, II, I
C) III, I, II
D) II, I, III
E) I, III, II

Question 22

This molecule combines with CO₂ to form the 3-carbon substance, 3-phosphoglycerate.

A) glyceraldehyde-3-phosphate (G3P)
B) glucose
C) ribulose biphoshpate (RuBP)
D) glycerol
E) nicotinamide adenine dinucleotide phosphate (NADPH)

Question 23

Which of the following is NOT a product of the Calvin cycle?

A) glyceraldehyde-3-phosphate (G3P)
B) NADP+
C) ADP
D) NADPH
E) Pi

Question 24

All of the following are required for the Calvin cycle EXCEPT

A) CO₂.
B) H₂O.
C) ATP.
D) NADPH.
E) rubisco.

Question 25

Which of the following statements about photorespiration is INCORRECT?

A) Photorespiration tends to occur under dry and hot conditions.
B) It utilizes oxygen to produce a 3-carbon sugar precursor.
C) It liberates CO₂.
D) It occurs in C3 plants.
E) It utilizes the enzyme PEP carboxylase rather than Rubisco to produce 3-phosphoglycerate.

Question 26

Which of the following has the highest photosynthetic efficiency in hot and dry environments?

A) C3 plants
B) C4 plants
C) plants undergoing photorespiration
D) plants that use oxygen to produce sugars
E) plants that only produce sugar in the dark

Question 27

Which is TRUE of succulent plants such as cacti or pineapple?

A) They are C3 plants.
B) They are highly efficient at photosynthesis in cooler and wet environments.
C) They tend to undergo substantial rates of photorespiration.
D) They produce 4-carbon malate in the first step of carbon fixation.
E) They continually produce sugar, both day and night under hot arid conditions.

Question 28

Organisms such as ourselves are best described as heterotrophs.

Question 29

Both photosystem I and II can harness light energy and split water to produce oxygen.

Question 30

The most efficient plants at producing sugars under hot and arid environments maximize photorespiration.