Question 1

Light dependent ATP production is called _____ and occurs in the _____ of chloroplasts.

Accepted Answer

A)  photophosphorylation; thylakoid membrane 
B)  photophosphorylation; inner membrane 
C)  non-oxidative phosphorylation; thylakoid membrane 
D)  non-oxidative phosphorylation; inner membrane 
E)  chloroplast-associated phosphorylation; thylakoid membrane 
A)  photophosphorylation; thylakoid membrane 
B)  photophosphorylation; inner membrane 
C)  non-oxidative phosphorylation; thylakoid membrane 
D)  non-oxidative phosphorylation; inner membrane 
E)  chloroplast-associated phosphorylation; thylakoid membrane A

Question 2

Which of the following can happen when a photosynthetic pigment absorbs light?

Accepted Answer

A)  energy lost as heat 
B)  energy given off by fluorescence 
C)  exciton transfer 
D)  photooxidation 
E)  all of the above 
A)  energy lost as heat 
B)  energy given off by fluorescence 
C)  exciton transfer 
D)  photooxidation 
E)  all of the above E

Question 3

Complete the following reaction: P680 + light $\rightarrow$ _____ $\rightarrow$ _____

Accepted Answer

A)  P680*; P680- + H+ 
B)  P680*; P680+ + e- 
C)  P680-; P680* 
D)  P680+; P680* 
E)  none of the above 
A)  P680*; P680- + H+ 
B)  P680*; P680+ + e- 
C)  P680-; P680* 
D)  P680+; P680* 
E)  none of the above B

Question 4

During the oxidation of water, where do the protons go?

Accepted Answer

A)  thylakoid lumen 
B)  stroma 
C)  space between inner and outer chloroplast membrane 
D)  cytosol 
E)  protons are not released but transferred to proteins for metabolic use 
A)  thylakoid lumen 
B)  stroma 
C)  space between inner and outer chloroplast membrane 
D)  cytosol 
E)  protons are not released but transferred to proteins for metabolic use

Question 5

Plastocyanin has an important

Accepted Answer

A)  water-splitting enzyme 
B)  quinone structure 
C)  Cu ion 
D)  heme structure 
E)  pigment 
A)  water-splitting enzyme 
B)  quinone structure 
C)  Cu ion 
D)  heme structure 
E)  pigment

Question 6

The light reactions of photosynthesis occur in the _____ membrane of the chloroplast.

Accepted Answer

The answer of The light reactions of photosynthesis occur in...

Question 7

What causes carboxylation of a critical lysine residue that coordinates Mg2+ in the rubisco active site to occur?

Accepted Answer

A)  when ATP levels are high due to high activity of the light reactions 
B)  when NADPH level are high due to high activity of the light reactions 
C)  when pH is low due to low activity of the light reactions 
D)  when pH is high due to high activity of the light reactions 
E)  when reduced ferredoxin is high due to high activity of the light reactions 
A)  when ATP levels are high due to high activity of the light reactions 
B)  when NADPH level are high due to high activity of the light reactions 
C)  when pH is low due to low activity of the light reactions 
D)  when pH is high due to high activity of the light reactions 
E)  when reduced ferredoxin is high due to high activity of the light reactions

Question 8

Which is true about nitrogenase?
I. Holds N2 to a metal ion during catalysis
II. Has N2 as its only substrate
III. Cleaves a triple bond
IV. Generates ammonia

Accepted Answer

A)  I and II 
B)  III and IV 
C)  III only 
D)  I, III and IV 
E)  II and IV 
A)  I and II 
B)  III and IV 
C)  III only 
D)  I, III and IV 
E)  II and IV

Question 9

Reduction of N2 requires

Accepted Answer

A)  energy 
B)  ATP hydrolysis 
C)  water-splitting enzyme 
D)  an enzyme similar to RuBisCo 
E)  Both A and B are correct 
A)  energy 
B)  ATP hydrolysis 
C)  water-splitting enzyme 
D)  an enzyme similar to RuBisCo 
E)  Both A and B are correct

Question 10

Which of the following shows the correct movement of electrons in the Z-scheme of photosynthesis?

Accepted Answer

A)  H2O $\rightarrow$ P700 $\rightarrow$plastoquinone $\rightarrow$cytochrome b6f $\rightarrow$ plastocyanin $\rightarrow$P680 $\rightarrow$ ferredoxin $\rightarrow$NADP+ 
B)  H2O $\rightarrow$ P680 $\rightarrow$plastocyanin $\rightarrow$cytochrome b6f $\rightarrow$ plastoquinone $\rightarrow$ P700$\rightarrow$ferredoxin$\rightarrow$NADP+ 
C)  H2O $\rightarrow$ P680 $\rightarrow$ plastoquinone $\rightarrow$ ferredoxin $\rightarrow$plastocyanin $\rightarrow$P700 $\rightarrow$cytochrome b6f $\rightarrow$ NADP+ 
D)  H2O $\rightarrow$ P680 $\rightarrow$plastoquinone $\rightarrow$ cytochrome b6f $\rightarrow$plastocyanin $\rightarrow$P700 $\rightarrow$ferredoxin $\rightarrow$NADP+ 
E)  H2O $\rightarrow$ P680 $\rightarrow$ ferredoxin $\rightarrow$plastoquinone $\rightarrow$ P700 $\rightarrow$ cytochrome b6f $\rightarrow$ plastocyanin $\rightarrow$NADP+ 
A)  H2O $\rightarrow$ P700 $\rightarrow$plastoquinone $\rightarrow$cytochrome b6f $\rightarrow$ plastocyanin $\rightarrow$P680 $\rightarrow$ ferredoxin $\rightarrow$NADP+ 
B)  H2O $\rightarrow$ P680 $\rightarrow$plastocyanin $\rightarrow$cytochrome b6f $\rightarrow$ plastoquinone $\rightarrow$ P700$\rightarrow$ferredoxin$\rightarrow$NADP+ 
C)  H2O $\rightarrow$ P680 $\rightarrow$ plastoquinone $\rightarrow$ ferredoxin $\rightarrow$plastocyanin $\rightarrow$P700 $\rightarrow$cytochrome b6f $\rightarrow$ NADP+ 
D)  H2O $\rightarrow$ P680 $\rightarrow$plastoquinone $\rightarrow$ cytochrome b6f $\rightarrow$plastocyanin $\rightarrow$P700 $\rightarrow$ferredoxin $\rightarrow$NADP+ 
E)  H2O $\rightarrow$ P680 $\rightarrow$ ferredoxin $\rightarrow$plastoquinone $\rightarrow$ P700 $\rightarrow$ cytochrome b6f $\rightarrow$ plastocyanin $\rightarrow$NADP+

Question 11

Plastoquinone is similar to mitochondrial ubiquinone in that

Accepted Answer

A)  Both are mobile carriers 
B)  Both go through a semiquinone redox state 
C)  Both carry two electrons 
D)  Both release one electron at a time to the next electron carrier in a Q cycle 
E)  All of the above are correct 
A)  Both are mobile carriers 
B)  Both go through a semiquinone redox state 
C)  Both carry two electrons 
D)  Both release one electron at a time to the next electron carrier in a Q cycle 
E)  All of the above are correct

Question 12

The chloroplast ATP synthase move protons from ___ with release of ATP into the ___.

Accepted Answer

lumen to s

Question 13

Regeneration of the rubisco substrate, ribulose-1,5-bisphosphate involves which of the following sugars?

Accepted Answer

A)  a tetrose-phosphate 
B)  a pentose-phosphate 
C)  a hexose-phosphate 
D)  a heptose-phosphate 
E)  all of the above 
A)  a tetrose-phosphate 
B)  a pentose-phosphate 
C)  a hexose-phosphate 
D)  a heptose-phosphate 
E)  all of the above

Question 14

The electron pathway from water to NADP+, referred to as the ____, allows two loci for photochemical events.

Accepted Answer

Question 15

In C4 plants, CO2 (as bicarbonate) is condensed with _____ to yield _____ in the mesophyll cells.

Accepted Answer

A)  pyruvate; oxaloacetate 
B)  3-phosphoglycerate; malate 
C)  lactate; fumarate 
D)  phosphoenolpyruvate; oxaloacetate 
E)  oxaloacetate; $\alpha$-ketoglutarate 
A)  pyruvate; oxaloacetate 
B)  3-phosphoglycerate; malate 
C)  lactate; fumarate 
D)  phosphoenolpyruvate; oxaloacetate 
E)  oxaloacetate; $\alpha$-ketoglutarate

Question 16

PSII oxidizes ____.

Accepted Answer

The answer of PSII oxidizes ____....

Question 17

How is ammonia toxic to many species?
I. Its effect on choline production makes it neurotoxic
II. It acidifies physiologic fluids
III. It depletes citric acid cycle intermediates
IV. It can interfere with nucleotide biosynthesis

Accepted Answer

A)  I and II 
B)  II, III and IV 
C)  III only 
D)  I and IV 
E)  I, II, III and IV 
A)  I and II 
B)  II, III and IV 
C)  III only 
D)  I and IV 
E)  I, II, III and IV

Question 18

Why does rubisco make up about half of the protein content in a typical chloroplast?

Accepted Answer

A)  most of the enzyme is in an oxidized state, waiting for the production of NADPH to reactivate it 
B)  it has an extremely high Km for CO2, thus a large number of enzymes increased the chance of substrate binding 
C)  since oxygen is also a substrate, those enzymes that bind oxygen are sequestered 
D)  it is a very inefficient enzyme, catalyzing only three reactions per second 
E)  none of the above 
A)  most of the enzyme is in an oxidized state, waiting for the production of NADPH to reactivate it 
B)  it has an extremely high Km for CO2, thus a large number of enzymes increased the chance of substrate binding 
C)  since oxygen is also a substrate, those enzymes that bind oxygen are sequestered 
D)  it is a very inefficient enzyme, catalyzing only three reactions per second 
E)  none of the above

Question 19

If carbon dioxide is used as a substrate, the major products of rubisco are _____; if oxygen is used as a substrate, the major products of rubisco are _____.

Accepted Answer

A)  2 molecules of 3-phosphoglycerate; 2-phosphoglycolate and 3-phosphoglycerate 
B)  2 molecules of 3-phosphoglycerate; glyoxylate and 3-phosphoglycerate 
C)  3-phosphoglycerate and glyceraldehyde-3-phosphate; 2-phosphoglycolate and 3-phosphoglycerate 
D)  3-phosphoglycerate and glyceraldehyde-3-phosphate; glyoxylate and 3-phosphoglycerate 
E)  none of the above 
A)  2 molecules of 3-phosphoglycerate; 2-phosphoglycolate and 3-phosphoglycerate 
B)  2 molecules of 3-phosphoglycerate; glyoxylate and 3-phosphoglycerate 
C)  3-phosphoglycerate and glyceraldehyde-3-phosphate; 2-phosphoglycolate and 3-phosphoglycerate 
D)  3-phosphoglycerate and glyceraldehyde-3-phosphate; glyoxylate and 3-phosphoglycerate 
E)  none of the above

Question 20

Electrons are transferred from P680 to _____, then to cytochrome b6f.

Accepted Answer

A)  ubiquinone 
B)  plastoquinone 
C)  plastocyanin 
D)  P700 
E)  NADP+ 
A)  ubiquinone 
B)  plastoquinone 
C)  plastocyanin 
D)  P700 
E)  NADP+

Exam 25: Photosynthesis Nitrogen

Light dependent ATP production is called _____ and occurs in the _____ of chloroplasts.

Which of the following can happen when a photosynthetic pigment absorbs light?

Complete the following reaction: P680 + light →\rightarrow→ _____ →\rightarrow→ _____

During the oxidation of water, where do the protons go?

Plastocyanin has an important

The light reactions of photosynthesis occur in the _____ membrane of the chloroplast.

What causes carboxylation of a critical lysine residue that coordinates Mg2+ in the rubisco active site to occur?

Which is true about nitrogenase? I. Holds N2 to a metal ion during catalysis II. Has N2 as its only substrate III. Cleaves a triple bond IV. Generates ammonia

Reduction of N2 requires

Which of the following shows the correct movement of electrons in the Z-scheme of photosynthesis?

Plastoquinone is similar to mitochondrial ubiquinone in that

The chloroplast ATP synthase move protons from ___ with release of ATP into the ___.

Regeneration of the rubisco substrate, ribulose-1,5-bisphosphate involves which of the following sugars?

The electron pathway from water to NADP+, referred to as the ____, allows two loci for photochemical events.

In C4 plants, CO2 (as bicarbonate) is condensed with _____ to yield _____ in the mesophyll cells.

PSII oxidizes ____.

How is ammonia toxic to many species? I. Its effect on choline production makes it neurotoxic II. It acidifies physiologic fluids III. It depletes citric acid cycle intermediates IV. It can interfere with nucleotide biosynthesis

Why does rubisco make up about half of the protein content in a typical chloroplast?

If carbon dioxide is used as a substrate, the major products of rubisco are _____; if oxygen is used as a substrate, the major products of rubisco are _____.

Electrons are transferred from P680 to _____, then to cytochrome b6f.

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

Light dependent ATP production is called _ and occurs in the _ of chloroplasts.

Complete the following reaction: P680 + light $\rightarrow$ _ $\rightarrow$ _

What causes carboxylation of a critical lysine residue that coordinates Mg²⁺ in the rubisco active site to occur?

The chloroplast ATP synthase move protons from _ with release of ATP into the _.

The electron pathway from water to NADP⁺, referred to as the ____, allows two loci for photochemical events.

In C₄ plants, CO₂ (as bicarbonate) is condensed with _ to yield _ in the mesophyll cells.

If carbon dioxide is used as a substrate, the major products of rubisco are _; if oxygen is used as a substrate, the major products of rubisco are _.

Electrons are transferred from P680 to _____, then to cytochrome b₆f.