Question 1

In the carbon assimilation ("dark") reactions of photosynthesis,the biosynthesis of 1 mol of hexose from 6 mol of carbon dioxide requires:

Accepted Answer

A)  12 mol of NADPH and 12 mol of ATP.
B)  12 mol of NADPH and 18 mol of ATP.
C)  18 mol of NADPH and 12 mol of ATP.
D)  18 mol of NADPH and 18 mol of ATP.
E)  no NADPH and 12 mol of ATP.F) B) and E)
G) B) and D)

Question 2

All are true of photorespiration except:

Accepted Answer

A)  It is driven by light.
B)  It oxidizes substrates to CO2.
C)  It produces O2.
D)  It results from a lack of specificity of the enzyme rubisco.
E)  It results in no fixation of carbon.F) B) and E)
G) B) and D)

Question 3

Explain why both ATP and NADPH are required for the operation of the Calvin cycle,and why these two reactants are required in different amounts.

Accepted Answer

ATP is required in two reactions of the ...

Question 4

The known mechanisms of activation of rubisco or of other enzymes of the Calvin cycle during illumination include all of the following except:

Accepted Answer

A)  increased stromal pH.
B)  light-driven entry of Mg2+ into the stroma.
C)  phosphorylation by cAMP-dependent protein kinase.
D)  phosphorylation of phosphoenolpyruvate carboxylase.
E)  reduction of a disulfide bridge by thioredoxin.F) C) and E)
G) C) and D)

Question 5

Which of these enzymes is not part of the Calvin cycle?

Accepted Answer

A)  Aldolase
B)  Glyceraldehyde 3-phosphate dehydrogenase
C)  Phosphofructokinase-1
D)  Ribulose-5-phosphate kinase
E)  TransketolaseF) A) and C)
G) A) and D)

Question 6

Which one of the following reactions,cycles,or pathways is not found in plant systems?

Accepted Answer

A)  The Calvin cycle
B)  The gluconeogenesis pathway
C)  The glyoxalate cycle
D)  The rubisco reaction
E)  The urea cycleF) D) and E)
G) B) and D)

Question 7

The synthesis of glycogen,starch,and sucrose all:

Accepted Answer

A)  involve addition of a sugar residue at the reducing end of the growing polymer.
B)  take place in liver and muscle of mammals.
C)  use a sugar nucleotide as substrate.
D)  use glucose 1-phosphate as the only substrate.
E)  use glucose-6-phosphate as substrate.F) A) and E)
G) A) and B)

Exam 20: Carbohydrate Biosynthesis in Plants and Bacteria

Explain why both ATP and NADPH are required for the operation of the Calvin cycle,and why these two reactants are required in different amounts.

Correct Answer
verified
ATP is required in two reactions of the ...
View Answer

In the carbon assimilation ("dark") reactions of photosynthesis,the biosynthesis of 1 mol of hexose from 6 mol of carbon dioxide requires:

Correct Answer
verified

Which of these enzymes is not part of the Calvin cycle?

Correct Answer
verified

The known mechanisms of activation of rubisco or of other enzymes of the Calvin cycle during illumination include all of the following except:

Correct Answer
verified

All are true of photorespiration except:

Correct Answer
verified

The synthesis of glycogen,starch,and sucrose all:

Correct Answer
verified

Which one of the following reactions,cycles,or pathways is not found in plant systems?

Correct Answer
verified

Exam 20: Carbohydrate Biosynthesis in Plants and Bacteria

Explain why both ATP and NADPH are required for the operation of the Calvin cycle,and why these two reactants are required in different amounts.

Correct AnswerverifiedATP is required in two reactions of the ...View AnswerShow Answer

In the carbon assimilation ("dark") reactions of photosynthesis,the biosynthesis of 1 mol of hexose from 6 mol of carbon dioxide requires:

Correct AnswerverifiedShow Answer

Which of these enzymes is not part of the Calvin cycle?

Correct AnswerverifiedShow Answer

The known mechanisms of activation of rubisco or of other enzymes of the Calvin cycle during illumination include all of the following except:

Correct AnswerverifiedShow Answer

All are true of photorespiration except:

Correct AnswerverifiedShow Answer

The synthesis of glycogen,starch,and sucrose all:

Correct AnswerverifiedShow Answer

Which one of the following reactions,cycles,or pathways is not found in plant systems?

Correct AnswerverifiedShow Answer

Correct Answer
verified
ATP is required in two reactions of the ...
View Answer

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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