Question 1

Which amino acids are the primary nitrogen donors for biosynthetic reactions in the cell?

Accepted Answer

A) glycine and glutamate 
B) glycine and serine 
C) glutamine and glutamate 
D) glutamine and serine 
E) serine and glutamate 
A) glycine and glutamate 
B) glycine and serine 
C) glutamine and glutamate 
D) glutamine and serine 
E) serine and glutamate C

Question 2

Which of these sets are products of the TCA (Krebs)Cycle?

Accepted Answer

A) NADH,ATP,CO₂,and oxaloacetate 
B) NADH,FADH₂,and GTP 
C) NADH,FADH₂,and oxaloacetate 
D) NADH,FADH₂,CO₂,and GTP 
E) NADH,FADH₂,CO₂,and oxaloacetate 
A) NADH,ATP,CO₂,and oxaloacetate 
B) NADH,FADH₂,and GTP 
C) NADH,FADH₂,and oxaloacetate 
D) NADH,FADH₂,CO₂,and GTP 
E) NADH,FADH₂,CO₂,and oxaloacetate D

Question 3

If glutamate synthesis within a cell is abnormally low,which of these molecules may also be present in abnormally low concentrations? (Select all that apply)

Accepted Answer

A) glutamine 
B) UTP 
C) ATP 
D) threonine 
E) proline 
A) glutamine 
B) UTP 
C) ATP 
D) threonine 
E) proline A,E

Question 4

How much energy is released when NADH donates its electrons to cytochrome b?

Accepted Answer

A) 0.245 kJ/mole 
B) -0.245 kJ/mole 
C) 37.3 kJ/mole 
D) -47.3 kJ/mole 
E) -27.2 kJ/mole 
A) 0.245 kJ/mole 
B) -0.245 kJ/mole 
C) 37.3 kJ/mole 
D) -47.3 kJ/mole 
E) -27.2 kJ/mole

Question 5

Lactic acid is a common fermentation product.It is produced when ___________ is reduced by electrons received from NADH.

Accepted Answer

A) ethanol 
B) glucose 
C) pyruvate 
D) acetyl-CoA 
E) 3-phosphoglyceraldehyde 
A) ethanol 
B) glucose 
C) pyruvate 
D) acetyl-CoA 
E) 3-phosphoglyceraldehyde

Question 6

(Glutamic acid + NH₃)is converted to glutamine ΔGᵒ' = +14.2 kJ/mole.Coupling this reaction with ATP hydrolysis yields an overall free energy value of:

Accepted Answer

A) 16.3 kJ/mole 
B) -16.3 kJ/mole 
C) 44.7 kJ/mole 
D) -44.7 kJ/mole 
E) -314 kJ/mole 
A) 16.3 kJ/mole 
B) -16.3 kJ/mole 
C) 44.7 kJ/mole 
D) -44.7 kJ/mole 
E) -314 kJ/mole

Question 7

Which statement is TRUE with respect to the electron transport system?

Accepted Answer

A) The electron transport system accepts electrons directly from glucose. 
B) In bacteria,the electron transport system is located in the cytoplasm. 
C) A proton motive force is generated as electrons move through the system to a terminal acceptor. 
D) In prokaryotes,protons are transported into the cell as electrons move through the system. 
E) ATP is produced by a process called substrate-level phosphorylation. 
A) The electron transport system accepts electrons directly from glucose. 
B) In bacteria,the electron transport system is located in the cytoplasm. 
C) A proton motive force is generated as electrons move through the system to a terminal acceptor. 
D) In prokaryotes,protons are transported into the cell as electrons move through the system. 
E) ATP is produced by a process called substrate-level phosphorylation.

Question 8

Amino acids which are deaminated can feed catabolically into the pathway(s): (Select all that apply)

Accepted Answer

A) Glycolysis 
B) TCA cycle 
C) Fermentation 
D) Electron transport system 
E) All are correct 
A) Glycolysis 
B) TCA cycle 
C) Fermentation 
D) Electron transport system 
E) All are correct

Question 9

The leguminous plant symbionts protect FeMo-co by:

Accepted Answer

A) sequestration of N² in heterocysts 
B) production of methemoglobin to lower oxidative potential within root nodules 
C) production of leghemoglobin to lower oxidative potential within root nodules 
D) production of leghemoglobin to lower reductive potential within root nodules 
E) inhibiting ATP formation 
A) sequestration of N² in heterocysts 
B) production of methemoglobin to lower oxidative potential within root nodules 
C) production of leghemoglobin to lower oxidative potential within root nodules 
D) production of leghemoglobin to lower reductive potential within root nodules 
E) inhibiting ATP formation

Question 10

The key carbon dioxide fixation reaction in the Calvin Cycle is carried out by which enzyme?

Accepted Answer

A) ribulose 1,5-bisphosphate carboxylase 
B) ribulose 1,5-bisphosphate kinase 
C) ribose 1,5-bisphosphate carboxylase 
D) ribose 1,5-bisphosphate kinase 
E) ribose 1,5-bisphosphate transcarboxylase 
A) ribulose 1,5-bisphosphate carboxylase 
B) ribulose 1,5-bisphosphate kinase 
C) ribose 1,5-bisphosphate carboxylase 
D) ribose 1,5-bisphosphate kinase 
E) ribose 1,5-bisphosphate transcarboxylase

Question 11

The products of yeast fermentation,following the Embden-Meyerhof pathway of glycolysis for one molecule of glucose,are two ethanol molecules as well as these others.

Accepted Answer

A) two ATP and two NADH 
B) two ATP,two NADH,and two CO₂ 
C) four ATP and two NADH 
D) two ATP and two CO₂ 
E) four ATP,two NADH,and two CO₂ 
A) two ATP and two NADH 
B) two ATP,two NADH,and two CO₂ 
C) four ATP and two NADH 
D) two ATP and two CO₂ 
E) four ATP,two NADH,and two CO₂

Question 12

What is dissimilatory nitrate reduction?

Accepted Answer

A) The production of nitrate from ammonia. 
B) The incorporation of nitrate into cellular material. 
C) Anaerobic reduction of nitrate. 
D) Nitrogen fixation. 
E) The production of nitrate from nitrite. 
A) The production of nitrate from ammonia. 
B) The incorporation of nitrate into cellular material. 
C) Anaerobic reduction of nitrate. 
D) Nitrogen fixation. 
E) The production of nitrate from nitrite.

Question 13

ATP donates energy through: (Select all that apply)

Accepted Answer

A) Phosphate ester bond hydrolysis 
B) Coupling with an endergonic reaction 
C) Anhydride bond hydrolysis 
D) Enzyme-mediated reactions 
E) none is a correct choice 
A) Phosphate ester bond hydrolysis 
B) Coupling with an endergonic reaction 
C) Anhydride bond hydrolysis 
D) Enzyme-mediated reactions 
E) none is a correct choice

Question 14

Nitrogen fixation is the reduction of _______ to ammonia for cell use.

Accepted Answer

A) nitrate 
B) nitrite 
C) hydroxylamine 
D) dinitrogen 
E) nitric oxide 
A) nitrate 
B) nitrite 
C) hydroxylamine 
D) dinitrogen 
E) nitric oxide

Question 15

The starting intermediate for the synthesis of the amino acid glutamate is α-ketoglutarate.

Accepted Answer

A) True 
 B)False

Question 16

How many ATP molecules is/are required to "fix" a molecule of nitrogen?

Accepted Answer

A) one 
B) two 
C) four 
D) eight 
E) sixteen 
A) one 
B) two 
C) four 
D) eight 
E) sixteen

Question 17

Disaccharides which can be utilized for energy via conversion to glucose include all of the following EXCEPT:

Accepted Answer

A) lactose 
B) maltose 
C) sucrose 
D) cellobiose 
E) hemicellulose 
A) lactose 
B) maltose 
C) sucrose 
D) cellobiose 
E) hemicellulose

Question 18

A net gain of four ATP are produced during glycolysis from the conversion of glucose to pyruvate.

Accepted Answer

A) True 
 B)False

Question 19

Which of these is an example of a coenzyme?

Accepted Answer

A) glucose 
B) iron 
C) NAD⁺ 
D) cytochrome c 
E) a kinase 
A) glucose 
B) iron 
C) NAD⁺ 
D) cytochrome c 
E) a kinase

Question 20

How is the activity of an allosteric enzyme regulated?

Accepted Answer

A) By a coenzyme. 
B) By covalent modification. 
C) Through the binding of an effector molecule. 
D) Through the binding of a competitive inhibitor. 
E) By substrate binding. 
A) By a coenzyme. 
B) By covalent modification. 
C) Through the binding of an effector molecule. 
D) Through the binding of a competitive inhibitor. 
E) By substrate binding.

Exam 13: Metabolism

Which amino acids are the primary nitrogen donors for biosynthetic reactions in the cell?

Which of these sets are products of the TCA (Krebs)Cycle?

If glutamate synthesis within a cell is abnormally low,which of these molecules may also be present in abnormally low concentrations? (Select all that apply)

How much energy is released when NADH donates its electrons to cytochrome b?

Lactic acid is a common fermentation product.It is produced when ___________ is reduced by electrons received from NADH.

(Glutamic acid + NH₃)is converted to glutamine ΔGᵒ' = +14.2 kJ/mole.Coupling this reaction with ATP hydrolysis yields an overall free energy value of:

Which statement is TRUE with respect to the electron transport system?

Amino acids which are deaminated can feed catabolically into the pathway(s): (Select all that apply)

The leguminous plant symbionts protect FeMo-co by:

The key carbon dioxide fixation reaction in the Calvin Cycle is carried out by which enzyme?

The products of yeast fermentation,following the Embden-Meyerhof pathway of glycolysis for one molecule of glucose,are two ethanol molecules as well as these others.

What is dissimilatory nitrate reduction?

ATP donates energy through: (Select all that apply)

Nitrogen fixation is the reduction of _______ to ammonia for cell use.

The starting intermediate for the synthesis of the amino acid glutamate is α-ketoglutarate.

How many ATP molecules is/are required to "fix" a molecule of nitrogen?

Disaccharides which can be utilized for energy via conversion to glucose include all of the following EXCEPT:

A net gain of four ATP are produced during glycolysis from the conversion of glucose to pyruvate.

Which of these is an example of a coenzyme?

How is the activity of an allosteric enzyme regulated?

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