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Metabolism of nitrogenous compounds test

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BLOCK F: LESSONS 29, 30 & 31

Question 1 of 13

1

What of the next statements is not true about pepsinogen?

Select one of the following:

  • Pepsinogen is a zymogen

  • The active form of pepsinogen is called pepsin

  • Pepsinogen is transformed into pepsin in a basic medium

  • Pepsin breaks the peptide bonds of proteins, so makes the proteins smaller

  • Pepsin is not the only proenzyme present in the intestine

Explanation

Question 2 of 13

1

Fill the blank spaces to complete the text.

For example, if we eat a protein from a vegetable, it will be due to the low pH, and then will act and will divide it in small fragments as dipeptides and peptides, that will release , which are going to be captured by the , and will be secreted into .

Explanation

Question 3 of 13

1

The AA digested can be used for the synthesis of non-proteic AA, synthesis of nitrogenous bases, synthesis of the heme group, synthesis of some neurotransmitters and synthesis of hormones and this is called the protein feedback

Select one of the following:

  • True
  • False

Explanation

Question 4 of 13

1

During desamination we will get one α-ketoacid and one amino acid.

Select one of the following:

  • True
  • False

Explanation

Question 5 of 13

1

Pyruvate and oxaloacetate are α-ketoacids

Select one of the following:

  • True
  • False

Explanation

Question 6 of 13

1

If glutamic acid is digested, what will probably happen?

Select one of the following:

  • It will react with pyruvate and Alanine will be obtained

  • It will react with oxaloacetate and Aspartic acid will be obtained

  • It will react with α-ketoglutamine and Proline will be obtained

  • It will suffer a desamination and will form α-ketoglutarate

  • It will suffer a desamination and will form one pyruvate

Explanation

Question 7 of 13

1

Glutamate dehydrogenase will be active when...?

Select one of the following:

  • The energy charge is low or, what is the same, with high levels of ADP

  • The energy charge is low or, what is the same, with high levels of ATP

  • The energy charge is high or, what is the same, with high levels of ADP

  • The energy charge is high or, what is the same, with high levels of ATP

  • Glutamate dehydrogenase is always active

Explanation

Question 8 of 13

1

Urea is produced and eliminated in liver

Select one of the following:

  • True
  • False

Explanation

Question 9 of 13

1

Which of these statements is true?

Select one of the following:

  • In the Glucose-Alanine cycle, one amino acid is transferred to one molecule of pyruvate, forming Alanine

  • In the Glucose-Alanine cycle, one ammonium ion is transferred to one molecule of oxaloacetate, forming Alanine

  • In the Glutamate-Glutamine cycle, one amino group is transported to one molecule of glutamic acid, forming Glutamate

  • In the Glutamate-Glutamine cycle, one amino group is transported to one molecule of glutamic acid, forming Glutamine

  • Any of these is true

Explanation

Question 10 of 13

4

Fill the blank spaces to complete the text.

Urea cycle:

1.) One ammonium ion, bicarbonate (HCO3), and 2 molecules of condense forming .
2.) This molecule condense with forming citrulline, and citrulline will be transferred to .
3.) There the citrulline condense with acid, what will form argininosuccinate.
4.) These molecule will be fragmented releasing arginine and .
5.) Arginine will be fragmented again forming urea and , that will be transferred back to mitochondria.

Explanation

Question 11 of 13

1

Which of these statements is true about the urea cycle?

Select one of the following:

  • 3 ATP are required, fumarate will be transported to CAC and aspartate forms part of the malate aspartate cycle

  • 3 ATP are required, aspartate will be transported to CAC and a fumarate forms part of the malate fumarate cycle

  • 2 ATP are required, fumarate will be transported to CAC and aspartate forms part of the malate aspartate cycle

  • 2 ATP are required, aspartate will be transported to CAC and a fumarate forms part of the malate fumarate cycle

  • Any of these is true

Explanation

Question 12 of 13

1

Which of these statements is true?

Select one of the following:

  • The enzyme that is regulated in the urea cycle is carbomoyl phosphate synthetase I, which activator is N-acetylglutamate and is produced in the presence of high levels of arginine.

  • The enzyme that is regulated in the urea cycle is carbomoyl phosphate synthetase I, which activator is N-acetylarginine and is produced in the presence of high levels of glutamate.

  • The enzyme that is regulated in the urea cycle is carbomoyl ammonium synthetase I, which activator is N-acetylglutamate and is produced in the presence of high levels of ammonium.

  • The enzyme that is regulated in the urea cycle is N-acetylglutamate synthetase I, which activator is carbomoyl phosphate and is produced in the presence of high levels of arginine.

  • The enzyme that is regulated in the urea cycle is N-acetylarginine synthetase I, which activator is carbomoyl phosphate and is produced in the presence of high levels of glutamate.

Explanation

Question 13 of 13

1

Carbon skeleton of AA can be used for the production of glucose or ketone bodies. Leucine for example can be used for the production of ketone bodies

Select one of the following:

  • True
  • False

Explanation

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