Question 1

Nitrogenase contains ___, unusual electron carrier(s).

Accepted Answer

A)  FeMo cluster 
B)  8Fe:7S cluster 
C)  4Fe:4S cluster 
D)  Both A and B are correct 
E)  All of the above are correct 
A)  FeMo cluster 
B)  8Fe:7S cluster 
C)  4Fe:4S cluster 
D)  Both A and B are correct 
E)  All of the above are correct

Question 2

Light-harvesting antennas gather photons and pass the energy to the ______.

Accepted Answer

A)  reaction center 
B)  thylakoid 
C)  plastid 
D)  stroma 
E)  matrix 
A)  reaction center 
B)  thylakoid 
C)  plastid 
D)  stroma 
E)  matrix

Question 3

Electron transport through the cytochrome b6f complex generates a(n) _____ gradient.

Accepted Answer

A)  proton 
B)  H+ 
C)  redox 
D)  light energy 
E)  Both A and B are correct 
A)  proton 
B)  H+ 
C)  redox 
D)  light energy 
E)  Both A and B are correct

Question 4

In chloroplasts

Accepted Answer

A)  water is oxidized and NAD is reduced 
B)  water is reduced and NADP is oxidized 
C)  water is split and NADP is reduced 
D)  water is split and NAD is oxidized 
E)  water is produced and NADPH is oxidized 
A)  water is oxidized and NAD is reduced 
B)  water is reduced and NADP is oxidized 
C)  water is split and NADP is reduced 
D)  water is split and NAD is oxidized 
E)  water is produced and NADPH is oxidized

Question 5

The active group of photosystem I is known as _____.

Accepted Answer

A)  P800 
B)  P700 
C)  P660 
D)  P650 
E)  P450 
A)  P800 
B)  P700 
C)  P660 
D)  P650 
E)  P450

Question 6

The production of one molecule of glucose requires _____.

Accepted Answer

A)  6 CO2, 9 ATP, 6 NADPH 
B)  6 CO2, 18 ATP, 12 NADPH 
C)  6 CO2, 6 ATP, 9 NADPH 
D)  6 CO2, 12 ATP, 18 NADPH 
E)  3 CO2, 9 ATP, 6 NADPH 
A)  6 CO2, 9 ATP, 6 NADPH 
B)  6 CO2, 18 ATP, 12 NADPH 
C)  6 CO2, 6 ATP, 9 NADPH 
D)  6 CO2, 12 ATP, 18 NADPH 
E)  3 CO2, 9 ATP, 6 NADPH

Question 7

In C4 plants, _____ is found in the mesophyll cells to capture CO2 while _____ is found in the bundle sheath cells to which releases CO2.

Accepted Answer

A)  phosphoenolpyruvate carboxylase; malate 
B)  pyruvate carboxylase; malic enzyme 
C)  pyruvate carboxylase; $\alpha$-ketoglutarate dehydrogenase 
D)  pyruvate kinase; pyruvate dehydrogenase 
E)  none of the above 
A)  phosphoenolpyruvate carboxylase; malate 
B)  pyruvate carboxylase; malic enzyme 
C)  pyruvate carboxylase; $\alpha$-ketoglutarate dehydrogenase 
D)  pyruvate kinase; pyruvate dehydrogenase 
E)  none of the above

Question 8

In the rubisco mechanism, what performs the nucleophilic attack on carbon dioxide?

Accepted Answer

A)  water 
B)  enediolate intermediate 
C)  enol intermediate 
D)  a carboxylate 
E)  none of the above 
A)  water 
B)  enediolate intermediate 
C)  enol intermediate 
D)  a carboxylate 
E)  none of the above

Question 9

The most abundant biological catalyst is ______.

Accepted Answer

A)  RuBisCO 
B)  ATP synthase 
C)  hexokinase 
D)  nitrogenase 
E)  water-splitting enzyme 
A)  RuBisCO 
B)  ATP synthase 
C)  hexokinase 
D)  nitrogenase 
E)  water-splitting enzyme

Question 10

What were the first organisms that had the ability to oxidize water to oxygen?

Accepted Answer

A)  flowering plants 
B)  green sulfur bacteria 
C)  cyanobacteria 
D)  ferns 
E)  green plants 
A)  flowering plants 
B)  green sulfur bacteria 
C)  cyanobacteria 
D)  ferns 
E)  green plants

Question 11

______ carries electrons between PSII and PSI.

Accepted Answer

A)  plastoquinone 
B)  carotene 
C)  NAD+ 
D)  NADP+ 
E)  ATP synthase 
A)  plastoquinone 
B)  carotene 
C)  NAD+ 
D)  NADP+ 
E)  ATP synthase

Question 12

In the Calvin cycle, ______ is "fixed" to generate carbohydrate molecules.

Accepted Answer

A)  water 
B)  H+ 
C)  O2 
D)  N2 
E)  CO2 
A)  water 
B)  H+ 
C)  O2 
D)  N2 
E)  CO2

Question 13

Fixation of one molecule of CO2 in the Calvin cycle requires ___ ATP and ___ NADPH.

Accepted Answer

Question 14

Although not completely clear, nitrogenase moves electrons from

Accepted Answer

A)  the P center to the FeMo cluster to the 4Fe:4S center 
B)  the 4FE:4S center to the P center to the FeMo cluster 
C)  the FeMo cluster to the P center to the 4Fe:4S center 
D)  the FeMo cluster to the P center to the 8Fe:7S cluster 
E)  the 8Fe:7S cluster to the P center to the FeMo cluster 
A)  the P center to the FeMo cluster to the 4Fe:4S center 
B)  the 4FE:4S center to the P center to the FeMo cluster 
C)  the FeMo cluster to the P center to the 4Fe:4S center 
D)  the FeMo cluster to the P center to the 8Fe:7S cluster 
E)  the 8Fe:7S cluster to the P center to the FeMo cluster

Question 15

During photosynthetic electron transport, protons are pumped from the ___ to the ___.

Accepted Answer

The answer of During photosynthetic electron transport, protons are pumped...

Question 16

Which is true about the differences between chloroplasts and mitochondria?

Accepted Answer

A)  Both have electron transport systems embedded in their inner membranes. 
B)  Both serve as the only source of ATP for the cell. 
C)  Both use electron transport systems to pump protons (H+) into the lumen/matrix. 
D)  Both use proton (H+) gradients to energize ATP synthesis via similar ATP synthases. 
E)  Both release ATP to their inner regions (lumen or matrix). 
A)  Both have electron transport systems embedded in their inner membranes. 
B)  Both serve as the only source of ATP for the cell. 
C)  Both use electron transport systems to pump protons (H+) into the lumen/matrix. 
D)  Both use proton (H+) gradients to energize ATP synthesis via similar ATP synthases. 
E)  Both release ATP to their inner regions (lumen or matrix).

Question 17

The overall reduction of one N2 molecule requires

Accepted Answer

A)  8 protons, 8 electrons, 16 ATP 
B)  8 protons, 8 electrons, 8 ATP 
C)  16 electrons 
D)  16 protons, 8 electrons, 16 ATP 
E)  8 protons, 16 electrons, 16 ATP 
A)  8 protons, 8 electrons, 16 ATP 
B)  8 protons, 8 electrons, 8 ATP 
C)  16 electrons 
D)  16 protons, 8 electrons, 16 ATP 
E)  8 protons, 16 electrons, 16 ATP

Question 18

Diazotrophs

Accepted Answer

A)  may be free-living cyanobacteria 
B)  may be symbionts living in root nodules of legumes 
C)  supply plants with nitrogen for production of plant biomolecules 
D)  can process atmospheric nitrogen into ammonia 
E)  All of the above are correct 
A)  may be free-living cyanobacteria 
B)  may be symbionts living in root nodules of legumes 
C)  supply plants with nitrogen for production of plant biomolecules 
D)  can process atmospheric nitrogen into ammonia 
E)  All of the above are correct

Question 19

Cytochrome b6f is most similar to mitochondrial _____ with the exception that electrons are passed to _____, not to cytochrome

Accepted Answer

A)  complex I; plastocyanin 
B)  complex I; plastoquinone 
C)  complex III; plastocyanin 
D)  complex III; plastoquinone 
E)  none of the mitochondrial complexes are similar to cytochrome b6f 
A)  complex I; plastocyanin 
B)  complex I; plastoquinone 
C)  complex III; plastocyanin 
D)  complex III; plastoquinone 
E)  none of the mitochondrial complexes are similar to cytochrome b6f

Exam 25: Photosynthesis Nitrogen

Nitrogenase contains ___, unusual electron carrier(s).

Light-harvesting antennas gather photons and pass the energy to the ______.

Electron transport through the cytochrome b6f complex generates a(n) _____ gradient.

In chloroplasts

The active group of photosystem I is known as _____.

The production of one molecule of glucose requires _____.

In C4 plants, _____ is found in the mesophyll cells to capture CO2 while _____ is found in the bundle sheath cells to which releases CO2.

In the rubisco mechanism, what performs the nucleophilic attack on carbon dioxide?

The most abundant biological catalyst is ______.

What were the first organisms that had the ability to oxidize water to oxygen?

______ carries electrons between PSII and PSI.

In the Calvin cycle, ______ is "fixed" to generate carbohydrate molecules.

Fixation of one molecule of CO2 in the Calvin cycle requires ___ ATP and ___ NADPH.

Although not completely clear, nitrogenase moves electrons from

During photosynthetic electron transport, protons are pumped from the ___ to the ___.

Which is true about the differences between chloroplasts and mitochondria?

The overall reduction of one N2 molecule requires

Diazotrophs

Cytochrome b6f is most similar to mitochondrial _____ with the exception that electrons are passed to _____, not to cytochrome

The Chemical Foundations of Biochemistry

Nucleic Acids

Proteins I

Proteins Iienzymes

Membranes and an Introduction to Signal Transduction

Carbohydrates I

The Common Catabolic Pathway

Carbohydrates II

Lipids I

Lipids II

Amine Metabolism

Metabolism Integration

Nucleotide Deoxynucleotide Metabolism

Dna Replication, Damage and Repair

Rna Synthesis

Protein

Control of Gene

Determination of Macromolecular Structure

Allosterism and Receptor-Ligand

Designer Proteins and Protein Folding

Biomolecule Purification

Bioinformatics and Omics

Signal

Protein Trafficking

Filters

Electron transport through the cytochrome b₆f complex generates a(n) _____ gradient.

In C₄ plants, _ is found in the mesophyll cells to capture CO₂ while _ is found in the bundle sheath cells to which releases CO₂.

Fixation of one molecule of CO₂ in the Calvin cycle requires _ ATP and _ NADPH.

During photosynthetic electron transport, protons are pumped from the _ to the _.

Cytochrome b₆f is most similar to mitochondrial _ with the exception that electrons are passed to _, not to cytochrome