Question 1

Photorespiration in plants involves the ________.

Accepted Answer

A) fixation of carbon dioxide to a four-carbon acid 
B) light-dependent uptake of O2 catalyzed by rubisco,followed by the release of CO2 
C) reduction of surface-exposed disulfides in the regulation of rubisco 
D) exclusive fixation of carbon dioxide at night by plants such as cacti 
A) fixation of carbon dioxide to a four-carbon acid 
B) light-dependent uptake of O2 catalyzed by rubisco,followed by the release of CO2 
C) reduction of surface-exposed disulfides in the regulation of rubisco 
D) exclusive fixation of carbon dioxide at night by plants such as cacti

Question 2

Rubisco often makes up to 50% of the soluble protein in plant leaves.

Accepted Answer

A) True 
 B)False

Question 3

Vitamin K is part of the electron chain in photosystem II.

Accepted Answer

A) True 
 B)False

Question 4

The C₄ pathway helps increase the concentration of carbon dioxide in the bundle sheath cells.This is important because the cell walls of these cells are impermeable to gases.

Accepted Answer

A) True 
 B)False

Question 5

What structural feature is most responsible for chlorophyll's ability to absorb light?

Accepted Answer

A) The magnesium ion. 
B) The conjugated double-bonds in the tetrapyrrole ring. 
C) The phytol side chain. 
D) An aromatic side chain attached to the tetrapyrrole ring. 
A) The magnesium ion. 
B) The conjugated double-bonds in the tetrapyrrole ring. 
C) The phytol side chain. 
D) An aromatic side chain attached to the tetrapyrrole ring.

Question 6

Starting with carbon dioxide fixation,which is the correct order for the stages of the Calvin cycle?

Accepted Answer

A) Carboxylation → Reduction → Regeneration. 
B) Regeneration → Carboxylation → Reduction. 
C) Carboxylation → Regeneration → Reduction. 
D) Reduction → Carboxylation → Regeneration. 
A) Carboxylation → Reduction → Regeneration. 
B) Regeneration → Carboxylation → Reduction. 
C) Carboxylation → Regeneration → Reduction. 
D) Reduction → Carboxylation → Regeneration.

Question 7

The nocturnal fixation of carbon dioxide in cacti helps ________.

Accepted Answer

A) stimulate photorespiration 
B) minimize use of ATP 
C) minimize water loss 
D) transport CO2 to the bundle sheath cells 
A) stimulate photorespiration 
B) minimize use of ATP 
C) minimize water loss 
D) transport CO2 to the bundle sheath cells

Question 8

Which enzyme is not part of the Calvin cycle?

Accepted Answer

A) Triose phosphate isomerase. 
B) Rubisco. 
C) Plastocyanin. 
D) Transketolase. 
A) Triose phosphate isomerase. 
B) Rubisco. 
C) Plastocyanin. 
D) Transketolase.

Question 9

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

Accepted Answer

A) True 
 B)False

Question 10

Two interdependent processes which comprise photosynthesis are (1)the formation of carbohydrates from CO2 and (2)the formation of ________.

Accepted Answer

A) ADP 
B) ATP 
C) NAD+ 
D) NADPH 
E) ATP and NADPH 
A) ADP 
B) ATP 
C) NAD+ 
D) NADPH 
E) ATP and NADPH

Question 11

The light-dependent reactions are located in the thylakoid membrane of chloroplasts,while the dark reactions are located within the lumen.

Accepted Answer

A) True 
 B)False

Question 12

In plants the light-harvesting complex (LHCII)completely surrounds PSII.

Accepted Answer

A) True 
 B)False

Question 13

Carotenoids,phycobilins,xanthophylls and chlorophyll molecules (that are not in the special pair)________.

Accepted Answer

A) can transfer light energy to chlorophylls 
B) can absorb light energy 
C) may prevent the formation of reactive superoxide anion 
D) A,B and C 
E) A and B only 
A) can transfer light energy to chlorophylls 
B) can absorb light energy 
C) may prevent the formation of reactive superoxide anion 
D) A,B and C 
E) A and B only

Question 14

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

Accepted Answer

A) True 
 B)False

Question 15

Most chlorophylls are green.This means they absorb in the ________ region of the visible spectrum.

Accepted Answer

A) green 
B) blue-violet 
C) red-orange 
D) blue-violet and red-orange 
E) infrared 
A) green 
B) blue-violet 
C) red-orange 
D) blue-violet and red-orange 
E) infrared

Question 16

In cacti ________ accumulates in the cell vacuoles at night that is released in the day and decarboxylated.

Accepted Answer

A) phosphoenolpyruvate 
B) malate 
C) oxaloacetate 
D) bicarbonate ion 
A) phosphoenolpyruvate 
B) malate 
C) oxaloacetate 
D) bicarbonate ion

Question 17

In plants,light energy channeled to PSII and PSI drives electron transport through a series of electron carriers.At the same time,protons are translocated into the ________.

Accepted Answer

A) stroma 
B) lumen 
C) granum 
D) plasma membrane 
A) stroma 
B) lumen 
C) granum 
D) plasma membrane

Question 18

The Calvin cycle occurs in the ________ of plant chloroplasts and in the ________ of bacteria.

Accepted Answer

A) lumen;plasma membrane 
B) stroma;cytosol 
C) grana lamellae;cytosol 
D) stroma;plasma membrane 
E) lumen;cytosol 
A) lumen;plasma membrane 
B) stroma;cytosol 
C) grana lamellae;cytosol 
D) stroma;plasma membrane 
E) lumen;cytosol

Question 19

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 20

Bacteria with PS I use sunlight to produce NADPH while those with PSII do not.

Accepted Answer

A) True 
 B)False

Exam 15: Photosynthesis

Photorespiration in plants involves the ________.

Rubisco often makes up to 50% of the soluble protein in plant leaves.

Vitamin K is part of the electron chain in photosystem II.

The C₄ pathway helps increase the concentration of carbon dioxide in the bundle sheath cells.This is important because the cell walls of these cells are impermeable to gases.

What structural feature is most responsible for chlorophyll's ability to absorb light?

Starting with carbon dioxide fixation,which is the correct order for the stages of the Calvin cycle?

The nocturnal fixation of carbon dioxide in cacti helps ________.

Which enzyme is not part of the Calvin cycle?

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

Two interdependent processes which comprise photosynthesis are (1)the formation of carbohydrates from CO2 and (2)the formation of ________.

The light-dependent reactions are located in the thylakoid membrane of chloroplasts,while the dark reactions are located within the lumen.

In plants the light-harvesting complex (LHCII)completely surrounds PSII.

Carotenoids,phycobilins,xanthophylls and chlorophyll molecules (that are not in the special pair)________.

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

Most chlorophylls are green.This means they absorb in the ________ region of the visible spectrum.

In cacti ________ accumulates in the cell vacuoles at night that is released in the day and decarboxylated.

In plants,light energy channeled to PSII and PSI drives electron transport through a series of electron carriers.At the same time,protons are translocated into the ________.

The Calvin cycle occurs in the ________ of plant chloroplasts and in the ________ of bacteria.

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

Bacteria with PS I use sunlight to produce NADPH while those with PSII do not.

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 Atp Synthesis

Lipid Metabolism

Amino Acid Metabolism

Nucleotide Metabolism

Nucleic Acids

DNA Replication, repair, and Recombination

Transcription and RNA Processing

Protein Synthesis

Filters

Two interdependent processes which comprise photosynthesis are (1)the formation of carbohydrates from CO₂ and (2)the formation of ________.

The Calvin cycle occurs in the of plant chloroplasts and in the of bacteria.