Question 1

Photosynthetic light absorption occurs in large pigment-protein complexes called __________.

Accepted Answer

A)  pigmentoses
B)  pigmentosystems
C)  antennoids
D)  photoids
E)  photosystemsF) A) and D)
G) A) and C)

Question 2

What enzyme is responsible for fixing CO2 out of the atmosphere in C4 plants?

Accepted Answer

A)  PEP decarboxylase
B)  ATP synthase
C)  PEP carboxylase
D)  Rubisco
E)  ribulose bisphosphate carboxylaseF) B) and E)
G) A) and E)

Question 3

What metal atom is part of the chlorophyll porphyrin ring?

Accepted Answer

A)  magnesium
B)  manganese
C)  platinum
D)  iron
E)  aluminumF) A) and B)
G) B) and E)

Question 4

Organisms that depend on an external source of organic compounds are called _________.

Accepted Answer

A)  autotrophs
B)  heterotrophs
C)  chemotrophs
D)  phototrophs
E)  externotrophsF) B) and D)
G) A) and C)

Question 5

2-phosphoglycolate is converted into glycolate by an enzyme in the ________.

Accepted Answer

A)  peroxisome
B)  glyoxysome
C)  stroma
D)  thylakoid disk
E)  thylakoid membraneF) A) and C)
G) A) and B)

Question 6

Which three organelles in a leaf are found closely associated with each other and cooperate with each other in such a way that products of one organelle serve as substrates in another?

Accepted Answer

A)  peroxisomes,lysosomes,mitochondria
B)  chloroplasts,mitochondria,lysosomes
C)  chloroplasts,nuclei,mitochondria
D)  mitochondria,chloroplasts,peroxisomes
E)  chloroplasts,nuclei,peroxisomesF) D) and E)
G) A) and B)

Question 7

What substance is attached to RuBP by Rubisco to make 2-phosphoglycolate?

Accepted Answer

A)  ATP
B)  O2
C)  CO2
D)  NADPH
E)  glycolateF) B) and D)
G) A) and B)

Question 8

Another investigator labels CO2 with radiolabeled 18O.After exposure of a plant adapted to a hot,dry climate to the radiolabeled CO2,in what molecule does the radiolabeled 18O appear?

Accepted Answer

It appears in a 4-ca...

Question 9

To what type of molecule does pheophytin pass its photoexcited electron?

Accepted Answer

A)  theophyllin
B)  plastoquinone
C)  another pheophytin
D)  xanthophylls
E)  succinate dehydrogenaseF) B) and C)
G) A) and E)

Question 10

Starch stored as granules in the chloroplasts serves what purpose?

Accepted Answer

A)  It causes plant cells to swell.
B)  It provides plants with sugars at night when light-dependent reactions are not possible.
C)  It provides plants with cellulose during the day.
D)  It supplies plants with ribulose bisphosphate.
E)  It causes plant cells to shrink.F) A) and E)
G) A) and D)

Question 11

A direct advantage of using water as an electron source for photosynthesis was that _________.

Accepted Answer

A)  organisms could live in fewer habitats than they could previously
B)  organisms could get larger
C)  organisms were able to live in a much more diverse array of habitats
D)  organisms could be smaller
E)  organisms could be rehydrated more readilyF) B) and C)
G) D) and E)

Question 12

Why are plants unlikely to produce many carbohydrates at night?

Accepted Answer

A)  Selected Calvin cycle enzymes are inactive in the dark because they denature at night.
B)  Selected Calvin cycle enzymes are immobilized at night.
C)  Chloroplasts shrink at night.
D)  Selected Calvin cycle enzymes are inactive in the dark because thioredoxin is oxidized and cannot reduce their disulfide linkages.
E)  Selected Calvin cycle enzymes are inactive in the dark because thioredoxin is reduced and can break their disulfide linkages.F) B) and D)
G) A) and E)

Question 13

Flattened membranous structures that connect the thylakoids of different grana are known as ______.

Accepted Answer

A)  grana thylakoids
B)  stroma thylakoids
C)  grana
D)  lumen
E)  stromaF) C) and D)
G) All of the above

Question 14

If water is labeled with 18O,where does the radiolabeled oxygen appear?

Accepted Answer

It appears in molecu...

Question 15

Which of the following is not a usual component found in the stroma?

Accepted Answer

A)  tRNAs
B)  prokaryote-like ribosomes
C)  circular DNA
D)  linear DNA
E)  many different polypeptidesF) C) and E)
G) A) and B)

Question 16

In chloroplasts,a proton gradient is established with a higher concentration of protons found in the ______ and a lower concentration in the ______.

Accepted Answer

A)  thylakoid lumen,intermembrane space
B)  intermembrane space,thylakoid lumen
C)  thylakoid lumen,stroma
D)  stroma,thylakoid lumen
E)  intermembrane space,matrixF) A) and B)
G) D) and E)

Question 17

What enzyme is the first enzyme in the C4 Hatch-Slack pathway that carries CO2 into the bundle sheath cells?

Accepted Answer

A)  Rubisco
B)  phosphenolpyruvate carboxylase
C)  pyruvate carboxylase
D)  phosphoenolpyruvate decarboxylase
E)  ATP synthaseF) A) and B)
G) C) and D)

Question 18

Which molecule conveys protons from the chloroplast stroma into the thylakoid lumen?

Accepted Answer

A)  cytochrome b6f
B)  plastocyanin
C)  phytochrome
D)  cytochrome c
E)  oxygenF) D) and E)
G) C) and D)

Question 19

Organisms that use the radiant energy of the sun to convert carbon dioxide to organic molecules like carbohydrates and proteins are called _____.

Accepted Answer

A)  chemoautotrophs
B)  chemoheterotrophs
C)  photoautotrophs
D)  photoheterotrophs
E)  didliotrophsF) A) and E)
G) B) and C)

Question 20

What metabolic process below do all eukaryotic green algae and higher plants have in common?

Accepted Answer

A)  glycolysis
B)  photosynthesis
C)  transcription
D)  translation
E)  All of these are correct.F) A) and E)
G) B) and D)

Exam 6: Photosynthesis and the Chloroplast

Why are plants unlikely to produce many carbohydrates at night?

Correct AnswerverifiedShow Answer

2-phosphoglycolate is converted into glycolate by an enzyme in the ________.

Correct AnswerverifiedShow Answer

What substance is attached to RuBP by Rubisco to make 2-phosphoglycolate?

Correct AnswerverifiedShow Answer

What metal atom is part of the chlorophyll porphyrin ring?

Correct AnswerverifiedShow Answer

What enzyme is responsible for fixing CO2 out of the atmosphere in C4 plants?

Correct AnswerverifiedShow Answer

Flattened membranous structures that connect the thylakoids of different grana are known as ______.

Correct AnswerverifiedShow Answer

Which three organelles in a leaf are found closely associated with each other and cooperate with each other in such a way that products of one organelle serve as substrates in another?

Correct AnswerverifiedShow Answer

A direct advantage of using water as an electron source for photosynthesis was that _________.

Correct AnswerverifiedShow Answer

Another investigator labels CO2 with radiolabeled 18O.After exposure of a plant adapted to a hot,dry climate to the radiolabeled CO2,in what molecule does the radiolabeled 18O appear?

Correct AnswerverifiedIt appears in a 4-ca...View AnswerShow Answer

In chloroplasts,a proton gradient is established with a higher concentration of protons found in the ______ and a lower concentration in the ______.

Correct AnswerverifiedShow Answer

Which molecule conveys protons from the chloroplast stroma into the thylakoid lumen?

Correct AnswerverifiedShow Answer

Organisms that use the radiant energy of the sun to convert carbon dioxide to organic molecules like carbohydrates and proteins are called _____.

Correct AnswerverifiedShow Answer

Starch stored as granules in the chloroplasts serves what purpose?

Correct AnswerverifiedShow Answer

Photosynthetic light absorption occurs in large pigment-protein complexes called __________.

Correct AnswerverifiedShow Answer

Which of the following is not a usual component found in the stroma?

Correct AnswerverifiedShow Answer

What enzyme is the first enzyme in the C4 Hatch-Slack pathway that carries CO2 into the bundle sheath cells?

Correct AnswerverifiedShow Answer

If water is labeled with 18O,where does the radiolabeled oxygen appear?

Correct AnswerverifiedIt appears in molecu...View AnswerShow Answer

To what type of molecule does pheophytin pass its photoexcited electron?

Correct AnswerverifiedShow Answer

What metabolic process below do all eukaryotic green algae and higher plants have in common?

Correct AnswerverifiedShow Answer

Organisms that depend on an external source of organic compounds are called _________.

Correct AnswerverifiedShow Answer

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What enzyme is responsible for fixing CO₂ out of the atmosphere in C₄ plants?

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Another investigator labels CO₂ with radiolabeled ¹⁸O.After exposure of a plant adapted to a hot,dry climate to the radiolabeled CO₂,in what molecule does the radiolabeled ¹⁸O appear?

Correct Answer
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It appears in a 4-ca...
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In chloroplasts,a proton gradient is established with a higher concentration of protons found in the and a lower concentration in the .

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What enzyme is the first enzyme in the C₄ Hatch-Slack pathway that carries CO₂ into the bundle sheath cells?

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If water is labeled with ¹⁸O,where does the radiolabeled oxygen appear?

Correct Answer
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It appears in molecu...
View Answer

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