Question 1

In the dark reactions of photosynthesis, glyceraldehyde-3-phosphate is converted to dihydroxyacetone phosphate by___.

Accepted Answer

Triose phosphate isomerase catalyzes the reversible interconversion between glyceraldehyde-3-phosphate (G3P) and dihydroxyacetone phosphate (DHAP), which are both intermediates in glycolysis and the Calvin cycle (dark reactions of photosynthesis).

Question 2

Matching 
Choose the correct answer from the list below. Not all the answers will be used.
-In the Calvin cycle, ______ is "fixed" to generate carbohydrate molecules.

Accepted Answer

CO₂ is fixed in the Calvin cycle to generate carbohydrate molecules.

Question 3

Electron transfer in PbRC is approximately ____ efficient.

Accepted Answer

E

Question 4

Matching 
Choose the correct answer from the list below. Not all the answers will be used.
-______ carries electrons between PSII and PSI.

Accepted Answer

Plastoquinone carries electrons between PSII and PSI during photosynthesis.

Question 5

Which of the following is TRUE regarding the oxygen evolving complex (OEC)? I.All states have high reduction potentials that exceed that of water. II.The OEC is made up of magnesium atoms that bridge oxygen atoms together. III.Current evidence indicates that the OEC cycles between five states in which the metal atoms exist in a variety of combinations of oxidation states. IV.During the course of reaction, protons and electrons are abstracted from one water molecule yielding one O₂.

Accepted Answer

The answer of Which of the following is TRUE regarding...

Question 6

The groups that initially absorb light in the Rps.viridis photosynthetic reaction center are observed to be arranged with ______, and are called the ______.

Accepted Answer

The Rps.viridis photosynthetic reaction center initially absorbs light through a pair of special chlorophyll a molecules, which are arranged with twofold symmetry. These chlorophyll molecules are referred to as the special pair.

Question 7

Matching Choose the correct answer from the list below. Not all the answers will be used. -The electron pathway from water to NADP⁺, referred to as the ____, allows two loci for photochemical events.

Accepted Answer

The Z-scheme refers to the electron transfer pathway from water to NADP+ in the thylakoid membranes, which involves two photochemical events at different loci (photosystem II and photosystem I).

Answer: A
 The photosynthetic reaction center is the site in photosystems I and II where light energy is absorbed and used to drive the transfer of electrons to electron acceptors.

Answer: D
 Water is the source of electrons for the electron pathway in photosynthesis, providing the initial reduction of photosystem II and release of molecular oxygen as a byproduct.

Question 8

An assembly of antenna pigments, or light harvesting complex,

Accepted Answer

Antenna pigments, or light harvesting complexes, are collections of pigment molecules that are optimized to transfer energy efficiently. They are not necessarily cytosolic proteins and their structures can vary somewhat between species. They are typically embedded in the membrane rather than containing an alternating structure of lipids and chlorophylls.

Question 9

Which statement about carotenoids is FALSE?

Accepted Answer

Carotenoids are not contained in the prosthetic ring structure of chlorophylls. They are separate pigments that absorb light in different areas of the spectrum and transfer the energy to chlorophylls.

Question 10

Matching 
Choose the correct answer from the list below. Not all the answers will be used.
-The light reactions of photosynthesis occur in the _____ membrane of the chloroplast.

Accepted Answer

The thylakoid membrane is where the light reactions of photosynthesis occur.

Answer: D
 Water (H₂O) is an essential molecule for the light reactions of photosynthesis as it is split to release electrons and oxygen during the process.

Answer: F
 The Z-scheme is the sequence of electron transfer reactions that occurs during the light reactions of photosynthesis.

Answer: G
 NADPH is a product of the light reactions of photosynthesis and is used in the Calvin cycle to reduce carbon dioxide.

Answer: H
 Plastoquinone is a molecule involved in the transfer of electrons during the light reactions of photosynthesis.

Answer: I
 H+ ions are pumped across the thylakoid membrane during the light reactions of photosynthesis, creating a proton gradient that is used to produce ATP.

Answer: M
 Oxygen (O₂) is a product of the light reactions of photosynthesis, released as a byproduct of water splitting.

Question 11

The photosynthetic electron transport system includes the transmembrane complexes PSI, PSII and

Accepted Answer

The photosynthetic electron transport system includes the transmembrane complexes PSI and PSII, which are connected by an electron transport chain that includes cytochrome b6f. There is no PSIII, and cytochrome a₃ and cytochrome c are also not directly involved in the electron transport chain between PSI and PSII. The proton translocating ATP synthase is involved in the production of ATP from the proton gradient established by the electron transport chain, but it is not a part of the electron transport chain itself.

Question 12

Matching 
Choose the correct answer from the list below. Not all the answers will be used.
-Light-harvesting antennas gather photons and pass the energy to the ______ .

Accepted Answer

Light energy is passed from the light-harvesting antennas to the photosynthetic reaction center, where it is used to excite electrons and initiate the process of photosynthesis.

Answer: H
 Plastoquinone is a molecule that accepts electrons from the photosynthetic reaction center and transfers them to the next molecule in the electron transport chain.

Answer: I
 The process of photosynthesis involves the movement of protons (H+) across the thylakoid membrane, which generates a proton gradient that is used to produce ATP.

Answer: K
 Carbon dioxide (CO2) is one of the reactants used in the process of photosynthesis, and is used to produce organic compounds during the Calvin cycle.

Answer: M
 Oxygen (O2) is one of the products of photosynthesis, and is produced when water (H2O) is split during the light-dependent reactions.

Question 13

Synthesis of sucrose requires which of the following?
I.glyceraldehyde-3-phosphate and/or dihydroxyacetone phosphate
II.sucrose phosphate kinase
III.sucrose phosphate phosphatase
IV.UTP

Accepted Answer

The synthesis of sucrose involves the conversion of glyceraldehyde-3-phosphate and dihydroxyacetone phosphate into fructose-6-phosphate via the enzyme aldolase. Fructose-6-phosphate is then converted to sucrose-6-phosphate by the enzyme sucrose phosphate synthase, with the use of UTP as an energy source. Finally, sucrose-6-phosphate is dephosphorylated into sucrose by the enzyme sucrose phosphate phosphatase. Thus, the necessary components for sucrose synthesis are (I) glyceraldehyde-3-phosphate and/or dihydroxyacetone phosphate, (III) sucrose phosphate phosphatase, and (IV) UTP. Sucrose phosphate kinase is not involved in the synthesis of sucrose, so choice (E) can be eliminated. Since choices (II) and (III) are both necessary for sucrose synthesis, choice (D) can be eliminated. Therefore, the best choice is (C) I, III, IV.

Question 14

Matching 
Choose the correct answer from the list below. Not all the answers will be used.
-PSII oxidizes ____.

Accepted Answer

PSII oxidizes H₂O to produce O₂ and H+.

Question 15

Matching Choose the correct answer from the list below. Not all the answers will be used. -Electron transport through the cytochrome b₆f complex generates a _____ gradient.

Accepted Answer

Electron transport through the cytochrome b₆f complex generates a proton (H+) gradient.

Question 16

Matching 
Choose the correct answer from the list below. Not all the answers will be used.
-The most abundant biological catalyst is ______.

Accepted Answer

The most abundant biological catalyst is RuBP carboxylase, also known as Rubisco. It is found in all photosynthetic organisms and is responsible for fixing carbon dioxide during photosynthesis.

Question 17

Light dependent ATP synthesis is called

Accepted Answer

Photophosphorylation is the process of generating ATP from ADP and inorganic phosphate using the energy of light during photosynthesis. This process occurs in the thylakoid membrane of chloroplasts and is a type of light-dependent ATP synthesis. Choice B, substrate-level phosphorylation, occurs during glycolysis and the Krebs cycle, but not during photosynthesis. Choice C, oxidative phosphorylation, occurs during cellular respiration, but not during photosynthesis. Choice D, pyrophosphorylation, is not a known process for ATP synthesis.

Question 18

Which of the following is the site of ATP synthesis in chloroplasts?

Accepted Answer

ATP synthesis in chloroplasts occurs in the thylakoid membrane, where the light-dependent reactions of photosynthesis take place, including the generation of ATP through the process of photophosphorylation.

Question 19

Matching 
Choose the correct answer from the list below. Not all the answers will be used.
-The chloroplast ATP synthase is also called ______.

Accepted Answer

The chloroplast ATP synthase is also called CF₁CF₀.

Question 20

Matching 
Choose the correct answer from the list below. Not all the answers will be used.
-The electrons abstracted by the oxygen evolving center (OEC)are relayed to a ______.

Accepted Answer

The answer of Matching 
Choose the correct answer from the...

Quiz 19: Photosynthesis

In the dark reactions of photosynthesis, glyceraldehyde-3-phosphate is converted to dihydroxyacetone phosphate by___.

Matching Choose the correct answer from the list below. Not all the answers will be used. -In the Calvin cycle, ______ is "fixed" to generate carbohydrate molecules.

Electron transfer in PbRC is approximately ____ efficient.

Matching Choose the correct answer from the list below. Not all the answers will be used. -______ carries electrons between PSII and PSI.

The groups that initially absorb light in the Rps.viridis photosynthetic reaction center are observed to be arranged with , and are called the .

Matching Choose the correct answer from the list below. Not all the answers will be used. -The electron pathway from water to NADP⁺, referred to as the ____, allows two loci for photochemical events.

An assembly of antenna pigments, or light harvesting complex,

Which statement about carotenoids is FALSE?

Matching Choose the correct answer from the list below. Not all the answers will be used. -The light reactions of photosynthesis occur in the _____ membrane of the chloroplast.

The photosynthetic electron transport system includes the transmembrane complexes PSI, PSII and

Matching Choose the correct answer from the list below. Not all the answers will be used. -Light-harvesting antennas gather photons and pass the energy to the ______ .

Synthesis of sucrose requires which of the following? I.glyceraldehyde-3-phosphate and/or dihydroxyacetone phosphate II.sucrose phosphate kinase III.sucrose phosphate phosphatase IV.UTP

Matching Choose the correct answer from the list below. Not all the answers will be used. -PSII oxidizes ____.

Matching Choose the correct answer from the list below. Not all the answers will be used. -Electron transport through the cytochrome b₆f complex generates a _____ gradient.

Matching Choose the correct answer from the list below. Not all the answers will be used. -The most abundant biological catalyst is ______.

Light dependent ATP synthesis is called

Which of the following is the site of ATP synthesis in chloroplasts?

Matching Choose the correct answer from the list below. Not all the answers will be used. -The chloroplast ATP synthase is also called ______.

Matching Choose the correct answer from the list below. Not all the answers will be used. -The electrons abstracted by the oxygen evolving center (OEC) are relayed to a ______.

Quiz 19: Photosynthesis

In the dark reactions of photosynthesis, glyceraldehyde-3-phosphate is converted to dihydroxyacetone phosphate by___.

Matching Choose the correct answer from the list below. Not all the answers will be used. -In the Calvin cycle, ______ is "fixed" to generate carbohydrate molecules.

Electron transfer in PbRC is approximately ____ efficient.

Matching Choose the correct answer from the list below. Not all the answers will be used. -______ carries electrons between PSII and PSI.

The groups that initially absorb light in the Rps.viridis photosynthetic reaction center are observed to be arranged with ______, and are called the ______.

Matching Choose the correct answer from the list below. Not all the answers will be used. -The electron pathway from water to NADP+, referred to as the ____, allows two loci for photochemical events.

An assembly of antenna pigments, or light harvesting complex,

Which statement about carotenoids is FALSE?

Matching Choose the correct answer from the list below. Not all the answers will be used. -The light reactions of photosynthesis occur in the _____ membrane of the chloroplast.

The photosynthetic electron transport system includes the transmembrane complexes PSI, PSII and

Matching Choose the correct answer from the list below. Not all the answers will be used. -Light-harvesting antennas gather photons and pass the energy to the ______ .

Synthesis of sucrose requires which of the following? I.glyceraldehyde-3-phosphate and/or dihydroxyacetone phosphate II.sucrose phosphate kinase III.sucrose phosphate phosphatase IV.UTP

Matching Choose the correct answer from the list below. Not all the answers will be used. -PSII oxidizes ____.

Matching Choose the correct answer from the list below. Not all the answers will be used. -Electron transport through the cytochrome b6f complex generates a _____ gradient.

Matching Choose the correct answer from the list below. Not all the answers will be used. -The most abundant biological catalyst is ______.

Light dependent ATP synthesis is called

Which of the following is the site of ATP synthesis in chloroplasts?

Matching Choose the correct answer from the list below. Not all the answers will be used. -The chloroplast ATP synthase is also called ______.

Matching Choose the correct answer from the list below. Not all the answers will be used. -The electrons abstracted by the oxygen evolving center (OEC) are relayed to a ______.

The groups that initially absorb light in the Rps.viridis photosynthetic reaction center are observed to be arranged with , and are called the .

Matching Choose the correct answer from the list below. Not all the answers will be used. -The electron pathway from water to NADP⁺, referred to as the ____, allows two loci for photochemical events.

Matching Choose the correct answer from the list below. Not all the answers will be used. -Electron transport through the cytochrome b₆f complex generates a _____ gradient.