Question 1

Choose the correct answer from the list below. Not all of the answers will be used.
-The ______________ enzymes transfer an ɑ-amino group from amino acids to ɑ-ketoglutarate.

Accepted Answer

Aminotransferases are the enzymes responsible for transferring an α-amino group from amino acids to α-ketoglutarate, forming glutamate.

Question 2

The urea cycle is linked to gluconeogenesis via formation of ___________________, a precursor of glucose synthesis.

Accepted Answer

fumarate

Question 3

The genetic deficiency of the enzyme ___________________ results in a condition referred to as phenylketonuria.

Accepted Answer

phenylalanine hydroxylase

Question 4

Choose the correct answer from the list below. Not all of the answers will be used.
-The molecule _______________ is oxidatively deaminated to an ammonium ion.

Accepted Answer

Glutamate is oxidatively deaminated by the enzyme glutamate dehydrogenase to form an ammonium ion.

Question 5

Choose the correct answer from the list below. Not all of the answers will be used.
-_______________ is caused by defects in the urea cycle, which lead to an elevated level of ammonia in blood.

Accepted Answer

Hyperammonemia is caused by defects in the urea cycle, leading to an elevated level of ammonia in the blood.

Question 6

Choose the correct answer from the list below. Not all of the answers will be used.
-Serine and threonine are deaminated by the enzyme _______________.

Accepted Answer

Serine and threonine are deaminated by the enzyme dehydratase.

Question 7

Choose the correct answer from the list below. Not all of the answers will be used. -The _______________ enzyme catalyzes an oxidative deamination and can utilize either NAD⁺ or NADP⁺.

Accepted Answer

Glutamate dehydrogenase catalyzes an oxidative deamination and can utilize either NAD+ or NADP+ as a cofactor.

Question 8

Choose the correct answer from the list below. Not all of the answers will be used.
-The product _______________ results when aspartate is transaminated with ɑ-ketoglutarate.

Accepted Answer

The answer of Choose the correct answer from the list...

Question 9

In the first step of the urea cycle, CO₂ and NH⁴⁺ are converted into ___________________.

Accepted Answer

The answer of In the first step of the urea...

Question 10

Choose the correct answer from the list below. Not all of the answers will be used.
-The molecule _______________ is formed from excess NH4+ by ureotelic organisms.

Accepted Answer

Urea is the molecule formed from excess NH4+ (ammonium ions) by ureotelic organisms as a means of excreting excess nitrogen.

Question 11

The hydrolysis of arginine by arginase produces ornithine and ___________________.

Accepted Answer

The answer of The hydrolysis of arginine by arginase produces...

Question 12

Choose the correct answer from the list below. Not all of the answers will be used.
-The methyl group donor _______________ is the product of the first step of methionine degradation.

Accepted Answer

S-adenosylmethionine (SAM) is the product of the first step of methionine degradation and serves as a methyl group donor in numerous biochemical reactions.

Question 13

Oxidative deamination of glutamate results in free ammonium ions and ___________________.

Accepted Answer

The answer of Oxidative deamination of glutamate results in free...

Question 14

Choose the correct answer from the list below. Not all of the answers will be used.
-The class of enzymes that cleaves most aromatic rings in biological systems is _____________.

Accepted Answer

Dioxygenases are the class of enzymes responsible for cleaving most aromatic rings in biological systems, playing a crucial role in the metabolism of various compounds.

Question 15

In adults, the urea cycle produces sufficient quantities of ___________________ so that it is not considered an essential amino acid.

Accepted Answer

The answer of In adults, the urea cycle produces sufficient...

Question 16

Nitrogen is transported from muscle to liver in the form of ___________________or _______________.

Accepted Answer

The answer of Nitrogen is transported from muscle to liver...

Question 17

Serine dehydratase catalyzes the conversion of serine into NH4+ and ___________________.

Accepted Answer

The answer of Serine dehydratase catalyzes the conversion of serine...

Question 18

In the degradation of amino acids, the amino nitrogens can eventually become the amino group of ___________________.

Accepted Answer

The answer of In the degradation of amino acids, the...

Question 19

___________________ is the prosthetic group used in deaminations by dehydratases.

Accepted Answer

The answer of ___________________ is the prosthetic group used in...

Question 20

Choose the correct answer from the list below. Not all of the answers will be used.
-The cofactor required by phenylalanine hydroxylase is _______________.

Accepted Answer

Phenylalanine hydroxylase requires biopterin as a cofactor to catalyze the hydroxylation of phenylalanine to tyrosine.

Quiz 30: Amino Acid Degradation and the Urea Cycle

Choose the correct answer from the list below. Not all of the answers will be used. -The ______________ enzymes transfer an ɑ-amino group from amino acids to ɑ-ketoglutarate.

The urea cycle is linked to gluconeogenesis via formation of ___________________, a precursor of glucose synthesis.

The genetic deficiency of the enzyme ___________________ results in a condition referred to as phenylketonuria.

Choose the correct answer from the list below. Not all of the answers will be used. -The molecule _______________ is oxidatively deaminated to an ammonium ion.

Choose the correct answer from the list below. Not all of the answers will be used. -_______________ is caused by defects in the urea cycle, which lead to an elevated level of ammonia in blood.

Choose the correct answer from the list below. Not all of the answers will be used. -Serine and threonine are deaminated by the enzyme _______________.

Choose the correct answer from the list below. Not all of the answers will be used. -The _______________ enzyme catalyzes an oxidative deamination and can utilize either NAD⁺ or NADP⁺.

Choose the correct answer from the list below. Not all of the answers will be used. -The product _______________ results when aspartate is transaminated with ɑ-ketoglutarate.

In the first step of the urea cycle, CO₂ and NH⁴⁺ are converted into ___________________.

Choose the correct answer from the list below. Not all of the answers will be used. -The molecule _______________ is formed from excess NH4+ by ureotelic organisms.

The hydrolysis of arginine by arginase produces ornithine and ___________________.

Choose the correct answer from the list below. Not all of the answers will be used. -The methyl group donor _______________ is the product of the first step of methionine degradation.

Oxidative deamination of glutamate results in free ammonium ions and ___________________.

Choose the correct answer from the list below. Not all of the answers will be used. -The class of enzymes that cleaves most aromatic rings in biological systems is _____________.

In adults, the urea cycle produces sufficient quantities of ___________________ so that it is not considered an essential amino acid.

Nitrogen is transported from muscle to liver in the form of _____or _.

Serine dehydratase catalyzes the conversion of serine into NH4+ and ___________________.

In the degradation of amino acids, the amino nitrogens can eventually become the amino group of ___________________.

___________________ is the prosthetic group used in deaminations by dehydratases.

Choose the correct answer from the list below. Not all of the answers will be used. -The cofactor required by phenylalanine hydroxylase is _______________.

Quiz 30: Amino Acid Degradation and the Urea Cycle

Choose the correct answer from the list below. Not all of the answers will be used. -The ______________ enzymes transfer an ɑ-amino group from amino acids to ɑ-ketoglutarate.

The urea cycle is linked to gluconeogenesis via formation of ___________________, a precursor of glucose synthesis.

The genetic deficiency of the enzyme ___________________ results in a condition referred to as phenylketonuria.

Choose the correct answer from the list below. Not all of the answers will be used. -The molecule _______________ is oxidatively deaminated to an ammonium ion.

Choose the correct answer from the list below. Not all of the answers will be used. -_______________ is caused by defects in the urea cycle, which lead to an elevated level of ammonia in blood.

Choose the correct answer from the list below. Not all of the answers will be used. -Serine and threonine are deaminated by the enzyme _______________.

Choose the correct answer from the list below. Not all of the answers will be used. -The _______________ enzyme catalyzes an oxidative deamination and can utilize either NAD+ or NADP+.

Choose the correct answer from the list below. Not all of the answers will be used. -The product _______________ results when aspartate is transaminated with ɑ-ketoglutarate.

In the first step of the urea cycle, CO2 and NH4+ are converted into ___________________.

Choose the correct answer from the list below. Not all of the answers will be used. -The molecule _______________ is formed from excess NH4+ by ureotelic organisms.

The hydrolysis of arginine by arginase produces ornithine and ___________________.

Choose the correct answer from the list below. Not all of the answers will be used. -The methyl group donor _______________ is the product of the first step of methionine degradation.

Oxidative deamination of glutamate results in free ammonium ions and ___________________.

Choose the correct answer from the list below. Not all of the answers will be used. -The class of enzymes that cleaves most aromatic rings in biological systems is _____________.

In adults, the urea cycle produces sufficient quantities of ___________________ so that it is not considered an essential amino acid.

Nitrogen is transported from muscle to liver in the form of ___________________or _______________.

Serine dehydratase catalyzes the conversion of serine into NH4+ and ___________________.

In the degradation of amino acids, the amino nitrogens can eventually become the amino group of ___________________.

___________________ is the prosthetic group used in deaminations by dehydratases.

Choose the correct answer from the list below. Not all of the answers will be used. -The cofactor required by phenylalanine hydroxylase is _______________.

Choose the correct answer from the list below. Not all of the answers will be used. -The _______________ enzyme catalyzes an oxidative deamination and can utilize either NAD⁺ or NADP⁺.

In the first step of the urea cycle, CO₂ and NH⁴⁺ are converted into ___________________.

Nitrogen is transported from muscle to liver in the form of _____or _.