Question 1

-In the accompanying figure, what does letter E represent?

Accepted Answer

A)  carbon dioxide
B)  light energy
C)  glucose
D)  ATP
E)  oxygenF) A) and D)
G) A) and C)

Question 2

The enzyme rubisco fixes carbon by attaching CO2 to ____.

Accepted Answer

A)  phosphoglycerate (PG
A)  
B)  ribulose bisphosphate (RuBP) 
C)  phosphoglyceraldehyde (PGAL) 
D)  glucose
E)  oxaloacetateF) A) and B)
G) C) and D)

Question 3

About 200 years ago, Jan Baptista van Helmont wondered how growing plants obtained the materials necessary for growth. He planted a tree seedling weighing 5 pounds in a barrel filled with 200 pounds of soil and then watered the tree regularly. After five years, the tree weighed 169 pounds, 3 ounces, and the soil weighed 199 pounds, 14 ounces. Because the tree had gained so much weight and the soil had lost so little, he concluded that the tree had gained all of its additional weight by absorbing the water he had added to the barrel. Of course he was incorrect. What really happened?

Accepted Answer

Let's look at the possibilities. The gai...

Question 4

Why is rubisco the most abundant protein on Earth?​

Accepted Answer

Photorespiration produces CO₂ and ammonia...

Question 5

Match each process or structure with its correct location within the chloroplast. Some choices may be used more than once.
-accumulation of hydrogen ions

Accepted Answer

A)  thylakoid membrane
B)  stroma
C)  thylakoid compartmentD) B) and C)
E) A) and C)

Question 6

What are the products of the light-dependent reactions of photosynthesis?

Accepted Answer

A)  ADP, NADP+, and sugars
B)  ADP, NADP+, and O2
C)  ATP, NADPH and O2
D)  ATP, NADPH, and CO2
E)  ATP, NADPH, and sugarsF) All of the above
G) C) and D)

Question 7

-According to the accompanying diagram, where are hydrogen ions sequestered?

Accepted Answer

A)  A
B)  B
C)  C
D)  D
E)  EF) A) and C)
G) A) and D)

Question 8

Match the description to the correct photosynthetic pathway.
-This process involves a photolysis step, breaking water into hydrogen ions and oxygen.

Accepted Answer

A)  light-dependent reactions in the noncyclic pathway
B)  light-dependent reactions in the cyclic pathway
C)  Calvin-Benson cycle
D)  C4 pathway
E)  photorespirationF) All of the above
G) B) and E)

Question 9

What do photosynthetic autotrophs use as a carbon source? What do they use as an energy source?

Accepted Answer

carbon dio...

Question 10

​Under intense sunlight, ____.

Accepted Answer

A)  ​the noncyclic pathway produces excess ATP
B)  ​the noncyclic pathway stalls and the cyclic pathway provides extra ATP
C)  ​excess free radicals are used to generate ATP for sugar production
D)  ​the noncyclic pathway becomes dominant as photosystem II stops releasing electrons
E)  ​carbon fixation ceases and leaf cells become dormantF) A) and B)
G) B) and E)

Question 11

The cyclic pathway of light-dependent reactions uses ____ to absorb light energy and emit electrons.​

Accepted Answer

A)  ​photosystems I and II
B)  ​photosystem II only
C)  ​photosystem I only
D)  ​ß-carotene
E)  ​ATP synthaseF) B) and E)
G) A) and B)

Question 12

Match the process to the correct description.
-PGA to PGAL conversion

Accepted Answer

A)  Rubisco attaches CO2 to RuBP.
B)  ATP and NADPH are required.
C)  Two PGALs combine to form a six-carbon product.
D)  O2, ATP, and NADPH are produced.
E)  An electron transport system produces ATP but not NADPH.F) A) and C)
G) A) and E)

Question 13

​Why is photorespiration an inefficient way to produce sugars?

Accepted Answer

A)  ​Photorespiration produces 7-carbon carbohydrate molecules instead of 6-carbon sugars.
B)  ​The increased production of O2 during photorespiration generates excess dangerous free radicals.
C)  ​Photorespiration only occurs during the night, when the light-dependent reactions are inactive.
D)  ​CO2 is lost instead of being fixed and ATP is required to detoxify the ammonia that is produced.
E)  ​Carbon fixation requires an extra turn of the Calvin-Benson cycle for each molecule of sugar produced.F) A) and D)
G) C) and D)

Question 14

Why do the cells of photosynthetic organisms contain accessory pigments?

Accepted Answer

A)  Accessory pigments provide a backup source of energy if the main pigment type fails.
B)  Accessory pigments direct light toward the primary pigment.
C)  Accessory pigments optimize the amount of energy that can be harvested in specific environments.
D)  Accessory pigments provide structural support for the primary pigments.
E)  Accessory pigments allow photosynthesis to occur at any time of the day.F) All of the above
G) A) and C)

Question 15

Four of the five items listed below participate in photosynthesis. Select the exception.

Accepted Answer

A)  photosystem
B)  chlorophyll
C)  mitochondrion
D)  chloroplast
E)  thylakoid membraneF) A) and D)
G) B) and C)

Question 16

Match each process or structure with its correct location within the chloroplast. Some choices may be used more than once.
-​photosystems I and II

Accepted Answer

A)  thylakoid membrane
B)  stroma
C)  thylakoid compartmentD) All of the above
E) B) and C) A

Question 17

Match each process or structure with its correct location within the chloroplast. Some choices may be used more than once.
-electron transport chain

Accepted Answer

A)  thylakoid membrane
B)  stroma
C)  thylakoid compartmentD) A) and C)
E) A) and B)

Question 18

Match each process or structure with its correct location within the chloroplast. Some choices may be used more than once.
-​ATP synthase

Accepted Answer

A)  thylakoid membrane
B)  stroma
C)  thylakoid compartmentD) None of the above
E) All of the above A

Question 19

Twelve PGAL molecules form when six carbon dioxide molecules are attached to six RuBP molecules. Only two of these PGAL molecules are needed to form a 6-carbon sugar. What is the fate of the 10 remaining PGAL molecules?

Accepted Answer

A)  They are degraded.
B)  They are converted back to carbon dioxide.
C)  They are stored as extra PGAL molecules.
D)  They are used during photorespiration.
E)  They are converted to RuBP molecules.F) A) and B)
G) B) and E) E

Question 20

How do C4 and CAM plants survive under dry conditions?

Accepted Answer

When plants close their stomata on hot, ...

Exam 6: Where It Starts-Photosynthesis

-In the accompanying figure, what does letter E represent?

Correct Answer
verified

The enzyme rubisco fixes carbon by attaching CO₂ to ____.

Correct Answer
verified

Correct Answer
verified
Let's look at the possibilities. The gai...
View Answer

Why is rubisco the most abundant protein on Earth?

Correct Answer
verified
Photorespiration produces CO₂ and ammonia...
View Answer

Match each process or structure with its correct location within the chloroplast. Some choices may be used more than once. -accumulation of hydrogen ions

Correct Answer
verified

What are the products of the light-dependent reactions of photosynthesis?

Correct Answer
verified

-According to the accompanying diagram, where are hydrogen ions sequestered?

Correct Answer
verified

Match the description to the correct photosynthetic pathway. -This process involves a photolysis step, breaking water into hydrogen ions and oxygen.

Correct Answer
verified

What do photosynthetic autotrophs use as a carbon source? What do they use as an energy source?

Correct Answer
verified
carbon dio...
View Answer

Under intense sunlight, ____.

Correct Answer
verified

The cyclic pathway of light-dependent reactions uses ____ to absorb light energy and emit electrons.

Correct Answer
verified

Match the process to the correct description. -PGA to PGAL conversion

Correct Answer
verified

Why is photorespiration an inefficient way to produce sugars?

Correct Answer
verified

Why do the cells of photosynthetic organisms contain accessory pigments?

Correct Answer
verified

Four of the five items listed below participate in photosynthesis. Select the exception.

Correct Answer
verified

Match each process or structure with its correct location within the chloroplast. Some choices may be used more than once. -photosystems I and II

Correct Answer
verified
A

Match each process or structure with its correct location within the chloroplast. Some choices may be used more than once. -electron transport chain

Correct Answer
verified

Match each process or structure with its correct location within the chloroplast. Some choices may be used more than once. -ATP synthase

Correct Answer
verified
A

Twelve PGAL molecules form when six carbon dioxide molecules are attached to six RuBP molecules. Only two of these PGAL molecules are needed to form a 6-carbon sugar. What is the fate of the 10 remaining PGAL molecules?

Correct Answer
verified
E

How do C4 and CAM plants survive under dry conditions?

Correct Answer
verified
When plants close their stomata on hot, ...
View Answer

Exam 6: Where It Starts-Photosynthesis

-In the accompanying figure, what does letter E represent?

Correct AnswerverifiedShow Answer

The enzyme rubisco fixes carbon by attaching CO2 to ____.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedLet's look at the possibilities. The gai...View AnswerShow Answer

Why is rubisco the most abundant protein on Earth?​

Correct AnswerverifiedPhotorespiration produces CO2 and ammonia...View AnswerShow Answer

Match each process or structure with its correct location within the chloroplast. Some choices may be used more than once. -accumulation of hydrogen ions

Correct AnswerverifiedShow Answer

What are the products of the light-dependent reactions of photosynthesis?

Correct AnswerverifiedShow Answer

-According to the accompanying diagram, where are hydrogen ions sequestered?

Correct AnswerverifiedShow Answer

Match the description to the correct photosynthetic pathway. -This process involves a photolysis step, breaking water into hydrogen ions and oxygen.

Correct AnswerverifiedShow Answer

What do photosynthetic autotrophs use as a carbon source? What do they use as an energy source?

Correct Answerverifiedcarbon dio...View AnswerShow Answer

​Under intense sunlight, ____.

Correct AnswerverifiedShow Answer

The cyclic pathway of light-dependent reactions uses ____ to absorb light energy and emit electrons.​

Correct AnswerverifiedShow Answer

Match the process to the correct description. -PGA to PGAL conversion

Correct AnswerverifiedShow Answer

​Why is photorespiration an inefficient way to produce sugars?

Correct AnswerverifiedShow Answer

Why do the cells of photosynthetic organisms contain accessory pigments?

Correct AnswerverifiedShow Answer

Four of the five items listed below participate in photosynthesis. Select the exception.

Correct AnswerverifiedShow Answer

Match each process or structure with its correct location within the chloroplast. Some choices may be used more than once. -​photosystems I and II

Correct AnswerverifiedA

Match each process or structure with its correct location within the chloroplast. Some choices may be used more than once. -electron transport chain

Correct AnswerverifiedShow Answer

Match each process or structure with its correct location within the chloroplast. Some choices may be used more than once. -​ATP synthase

Correct AnswerverifiedA

Twelve PGAL molecules form when six carbon dioxide molecules are attached to six RuBP molecules. Only two of these PGAL molecules are needed to form a 6-carbon sugar. What is the fate of the 10 remaining PGAL molecules?

Correct AnswerverifiedE

How do C4 and CAM plants survive under dry conditions?

Correct AnswerverifiedWhen plants close their stomata on hot, ...View AnswerShow Answer

Correct Answer
verified

The enzyme rubisco fixes carbon by attaching CO₂ to ____.

Correct Answer
verified

Correct Answer
verified
Let's look at the possibilities. The gai...
View Answer

Why is rubisco the most abundant protein on Earth?

Correct Answer
verified
Photorespiration produces CO₂ and ammonia...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
carbon dio...
View Answer

Under intense sunlight, ____.

Correct Answer
verified

The cyclic pathway of light-dependent reactions uses ____ to absorb light energy and emit electrons.

Correct Answer
verified

Correct Answer
verified

Why is photorespiration an inefficient way to produce sugars?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Match each process or structure with its correct location within the chloroplast. Some choices may be used more than once. -photosystems I and II

Correct Answer
verified
A

Correct Answer
verified

Match each process or structure with its correct location within the chloroplast. Some choices may be used more than once. -ATP synthase

Correct Answer
verified
A

Correct Answer
verified
E

Correct Answer
verified
When plants close their stomata on hot, ...
View Answer