BIOCHEM EXAM 4 FINA L

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BIOCHEM EXAM 4( FINA L)

QUESTIONS AND ANSWER S A+

GRADE ASSURED

Question 1: Deamination of most amino acids in the liver

is accompanied by the conversion of:

• pyruvate into alanine.
• glutamate into glutamine.
• alpha-ketoglutarate into glutamate.
• nitrogen into urea.
• oxaloacetate into aspartate.

Correct answer: alpha-ketoglutarate into glutamate.

Question 2: Which cofactor is typically required in

transamination reactions?

• pyridoxal-phosphate
• coenzyme Q
• biotin
• thiamin pyrophosphate
• nicotinamide adenine dinucleotide

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Correct answer: pyridoxal-phosphate

Question 3: Which amino acid can be considered to be

both glucogenic and ketogenic?

• threonine
• aspartate
• leucine
• isoleucine
• both threonine and isoleucine

Correct answer: both threonine and isoleucine

Question 4: In which pair of compounds is the second

molecule produced by the deamination of the first molecule?

• aspartic acid and oxaloacetate
• glutamine and glutamate
• alanine and pyruvate
• All of the answers are correct.
• None of the answers is correct.

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Correct answer: All of the answers are correct.

Question 5: Nitrogen from protein is eliminated as what

compound in animals?

• ammonia
• urea
• pyrimidine
• both ammonia and urea
• both urea and pyrimidine

Correct answer: both ammonia and urea

Question 6: Which statement is FALSE for uric acid?

• This compound is produced in humans as a result of

high-protein diets.

• This compound is the major means of nitrogen

elimination in birds.

• This compound is a purine base.
• This compound is a product of both protein and

nucleic acid catabolism.

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• None of the statements is false.

Correct answer: None of the statements is false.

Question 7: Which amino acid is used to transport

nitrogen to the liver?

• alanine
• asparagine
• glutamine
• glutamate
• both alanine and glutamine

Correct answer: both alanine and glutamine

Question 8: Phenylketoneuria is associated with disorders

in the catabolism of which amino acid?

• phenylalanine
• tyrosine
• tryptophan
• histidine

Correct answer: phenylalanine