Question 1

Photorespiration is a vital plant pathway that provides energy for cellular metabolism.

Accepted Answer

A) True 
 B)False

Question 2

The formation of ATP is a/an reaction in plants.

Accepted Answer

A)  dark 
B)  light independent 
C)  light dependent 
D)  anaerobic 
E)  carbon fixation 
A)  dark 
B)  light independent 
C)  light dependent 
D)  anaerobic 
E)  carbon fixation

Question 3

All photosynthetic bacteria give off O2 as an end-product of photosynthesis.

Accepted Answer

A) True 
 B)False

Question 4

Chlorophyll molecules contain hydrophilic regions containing bonds for light-absorbing and hydrophobic regions anchoring them to membranes.

Accepted Answer

A) True 
 B)False

Question 5

The source of electrons for green sulfur bacteria is , and the source of electrons for cyanobacteria is .

Accepted Answer

A)  NADPH; NAD+  
B)  H2S; H2O 
C)  H2O; H2S 
D)  cytochrome c; cytochrome bf 
A)  NADPH; NAD+  
B)  H2S; H2O 
C)  H2O; H2S 
D)  cytochrome c; cytochrome bf

Question 6

Which statement is false about bacteriorhodopsin?

Accepted Answer

A)  It occurs in archaebacteria. 
B)  A molecule of retinal inside bacteriorhodopsin converts from the trans to the cis configuration when light is absorbed. 
C)  It creates a light-induced proton gradient across a membrane. 
D)  Its activity is coupled to PSI and PSII. 
A)  It occurs in archaebacteria. 
B)  A molecule of retinal inside bacteriorhodopsin converts from the trans to the cis configuration when light is absorbed. 
C)  It creates a light-induced proton gradient across a membrane. 
D)  Its activity is coupled to PSI and PSII.

Question 7

The region of the chlorophyll molecule that helps anchor it in the membrane is the

Accepted Answer

A)  Mg2+ ion. 
B)  chlorin ring. 
C)  phytol side chain. 
D)  tetrapyrrole ring. 
E)  All of the above 
A)  Mg2+ ion. 
B)  chlorin ring. 
C)  phytol side chain. 
D)  tetrapyrrole ring. 
E)  All of the above

Question 8

The site of light-dependent reactions in the chloroplast is

Accepted Answer

A)  the stroma. 
B)  the thylakoids. 
C)  the outer membrane. 
D)  the lumen. 
E)  All of the above 
A)  the stroma. 
B)  the thylakoids. 
C)  the outer membrane. 
D)  the lumen. 
E)  All of the above

Question 9

The compound 2-carboxyarabinitol 1-phosphate is present in plants only at night and is a strong activator of rubisco.

Accepted Answer

A) True 
 B)False

Question 10

How many ATP molecules are required for the fixation of one CO2 molecule via the Calvin cycle to a triose phosphate?

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
A)  1 
B)  2 
C)  3 
D)  4

Question 11

The translocation of protons across the thylakoid membrane creates a proton motive force necessary for ATP synthesis.

Accepted Answer

A) True 
 B)False

Question 12

The only plant pigments responsible for light harvesting are chlorophylls.

Accepted Answer

A) True 
 B)False

Question 13

Photosynthesis by green sulfur bacteria and cyanobacteria are different because green sulfur bacteria .

Accepted Answer

A)  have only cyclic photosynthesis 
B)  use photosystem I, but not photosystem II 
C)  use both photosystems I and II 
D)  use cytochromes 
A)  have only cyclic photosynthesis 
B)  use photosystem I, but not photosystem II 
C)  use both photosystems I and II 
D)  use cytochromes

Question 14

The structure of Rubisco is nearly identical in all phototrophs. All known forms of Rubisco have the same number of subunits.

Accepted Answer

A) True 
 B)False

Question 15

Which statement is false about ferredoxin?

Accepted Answer

A)  It is produced by PSII. 
B)  It is formed in the stroma. 
C)  It participates in the reduction of NADP+. 
D)  It can serve as an electron donor to cytochrome bf. 
A)  It is produced by PSII. 
B)  It is formed in the stroma. 
C)  It participates in the reduction of NADP+. 
D)  It can serve as an electron donor to cytochrome bf.

Question 16

Dark reactions of photosynthesis must occur in the absence of light.

Accepted Answer

A) True 
 B)False

Question 17

In the Z scheme describing electron flow in photosynthesis, the electron donor to P680 is , while the electron donor to P700 is .

Accepted Answer

A)  H2O; plastocyanin 
B)  plastocyanin; H2O 
C)  O2; plastocyanin 
D)  plastocyanin; O2 
E)  O2; H2O 
A)  H2O; plastocyanin 
B)  plastocyanin; H2O 
C)  O2; plastocyanin 
D)  plastocyanin; O2 
E)  O2; H2O

Question 18

Electron carriers between activated P680* and P700 photosystems include

Accepted Answer

A)  plastoquinones. 
B)  pheophytin. 
C)  ferredoxin and iron - sulfur clusters. 
D)  All of the above 
E)  A and B 
A)  plastoquinones. 
B)  pheophytin. 
C)  ferredoxin and iron - sulfur clusters. 
D)  All of the above 
E)  A and B

Question 19

Which statement is true about starch?

Accepted Answer

A)  It is synthesized during daylight and consumed at night. 
B)  Its synthesis occurs at a fairly continuous rate both day and night. 
C)  Its synthesis is inhibited by high concentrations of 3-phosphoglycerate. 
D)  Starch can be hydrolyzed by amylase to produce triose phosphates. 
E)  A and D 
A)  It is synthesized during daylight and consumed at night. 
B)  Its synthesis occurs at a fairly continuous rate both day and night. 
C)  Its synthesis is inhibited by high concentrations of 3-phosphoglycerate. 
D)  Starch can be hydrolyzed by amylase to produce triose phosphates. 
E)  A and D

Question 20

Most plants contain a rubisco enzyme that catalyzes only a carboxylation reaction in the fixation of carbon dioxide.

Accepted Answer

A) True 
 B)False

Exam 15: Photosynthesis

Photorespiration is a vital plant pathway that provides energy for cellular metabolism.

The formation of ATP is a/an reaction in plants.

All photosynthetic bacteria give off O2 as an end-product of photosynthesis.

Chlorophyll molecules contain hydrophilic regions containing bonds for light-absorbing and hydrophobic regions anchoring them to membranes.

The source of electrons for green sulfur bacteria is , and the source of electrons for cyanobacteria is .

Which statement is false about bacteriorhodopsin?

The region of the chlorophyll molecule that helps anchor it in the membrane is the

The site of light-dependent reactions in the chloroplast is

The compound 2-carboxyarabinitol 1-phosphate is present in plants only at night and is a strong activator of rubisco.

How many ATP molecules are required for the fixation of one CO2 molecule via the Calvin cycle to a triose phosphate?

The translocation of protons across the thylakoid membrane creates a proton motive force necessary for ATP synthesis.

The only plant pigments responsible for light harvesting are chlorophylls.

Photosynthesis by green sulfur bacteria and cyanobacteria are different because green sulfur bacteria .

The structure of Rubisco is nearly identical in all phototrophs. All known forms of Rubisco have the same number of subunits.

Which statement is false about ferredoxin?

Dark reactions of photosynthesis must occur in the absence of light.

In the Z scheme describing electron flow in photosynthesis, the electron donor to P680 is , while the electron donor to P700 is .

Electron carriers between activated P680* and P700 photosystems include

Which statement is true about starch?

Most plants contain a rubisco enzyme that catalyzes only a carboxylation reaction in the fixation of carbon dioxide.

Introduction to Biochemistry

Water

Amino Acids and the Primary Structures of Proteins

Proteins: Three-Dimensional Structure and Function

Properties of Enzymes

Mechanisms of Enzymes

Coenzymes and Vitamins

Carbohydrates

Lipids and Membranes

Introduction to Metabolism

Glycolysis

Gluconeogenesis, the Pentose Phosphate Pathway, and Glycogen Metabolism

The Citric Acid Cycle

Electron Transport and Oxidative Phosphorylation

Lipid Metabolism

Amino Acid Metabolism

Nucleotide Metabolism

Nucleic Acids

Dna Replication, Repair, and Recombination

Transcription and Rna Processing

Protein Synthesis

Recombinant Dna Technology

Filters

All photosynthetic bacteria give off O₂as an end-product of photosynthesis.

How many ATP molecules are required for the fixation of one CO₂molecule via the Calvin cycle to a triose phosphate?

Electron carriers between activated P680^*and P700 photosystems include