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4516 Biochemistry

A 32-year-old woman who has been on oral contraceptive pills for 5 years, developed symptoms of depression, irritability, nervousness and mental confusion. Her hemoglobin level was 8g/dl. Biochemical investigations revealed that she was excreting highly elevated concentrations of xanthurenic acid in urine. She also showed high levels of triglycerides and cholesterol in serum. All of the above are most probably related to a vitamin B6 deficiency caused by prolonged oral contraceptive use except:

AIncreased urinary xanthurenic acid excretion
BNeurological symptoms by decreased synthesis of biogenic amines
CDecreased hemoglobin level
DIncreased triglyceride and cholesterol levels
Biochemistry
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4518 Biochemistry

All of the following are true EXCEPT

AAbsence from the diet of ceain amino acids that are present in most proteins is not deleterious to human health
BTetrahydrobiopterin is involved in tryptophan biosynthesis
CSelenocysteine is an essential component of several mammalian proteins
DIntermediates of the citric acid cycle and of glycolysis acts as precursors of aspaate, asparagine, glutamate, glutamine, glycine, and serine
Biochemistry
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