Week 14

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University of New England *

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1005

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Chemistry

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Jan 9, 2024

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5

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Week 14 Question 1 (1 point) Nitrogen from amino acid metabolism is incorporated into all of the following compounds except: Question 1 options: Nucleotides Urea Arginine Cholesterol Question 2 (1 point) A newborn becomes lethargic after several feedings and the assigned nurse describes an unusual smell to the urine. Evaluation for an inborn error of metabolism shows an elevation of branch-chain amino acids. Elevation of which of the following amino acids would be consistent with the report? Question 2 options: Isoleucine*** Lysine Threonine Aspartic acid Arginine Question 3 (1 point)
Phenylketonuria can present due to a deficiency in which of the following required metabolic cofactors? Question 3 options: Cobalamin (B12) Tetrahydrofolate (THF) Tetrahydrobiopterin (BH4)*** Tyrosine Question 4 (1 point) Supplementation of which of the following cofactors/coenzymes may assist the activity of branched- chain ketoacid dehydrogenase? Question 4 options: Cobalamin Tetrahydrobiopterin (BH4) Pyridoxal phosphate (PLP) Thiamine*** Folate Question 5 (1 point)
A 52-year-old male sought medical attention due to the progressive appearance of hyperchromic (hyperpigmented) papules on the edge of the second finger of both hands and darkening of his urine. Tissue biopsy and urine sample tested positive for homogentisic acid. Based on these findings a diagnosis of alkaptonuria is made. This diagnosis is consistent with a deficiency in which of the following enzymes? Question 5 options: Phenylalanine hydroxylase Homogentisate oxidase*** α- ketoacid dehydrogenase Tyrosinase Question 6 (1 point) A deficiency in vitamin B6 (pyridoxal phosphate) would negatively impact which of the following pathways: Metabolism of cysteine to homocysteine Metabolism of phenylalanine to tyrosine Conversion of methyl malonyl-Co A to succinyl-CoA Question 6 options: 1 only*** 2 only 2 and 3 1 and 2 Question 7 (1 point)
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In the case of a deficiency in phenylalanine hydroxylase which of the following amino acids will become essential? Question 7 options: Cysteine Methionine Tryptophan Tyrosine*** Homocysteine Question 8 (1 point) The chemical reaction below (Figure 1) depicts the conversion of phenylalanine to tyrosine. Select the enzyme that is responsible for the conversion of PHE to TYR. Figure 01 Phenylalanine (PHE) Tyrosine (TYR) Question 8 options: Phenylalanine N-methyltransferase Phenylalanine hydroxylase***
Phenylalanine O-demethylase Phenylalanine decarboxylase Phenylalanine reductase

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