Enzymes - Mock Test 45

Question 441

In normal individuals glycosuria occurs when the venous blood glucose concentration exceeds?

A) 5–6 mmol/L B) 7–8 mmol/L C) 8.5–9 mmol/L D) 9.5–10 mmol/L

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Question 442

Essential fructosuria is characterized by the lack of the hepatic enzyme?

A) Phosphohexose isomerase B) Aldalose A C) Aldolase B D) Fructokinase

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Question 443

Hereditary fructose intolerance involves the absence of the enzyme?

A) Aldalose B B) Fructokinase C) Triokinase D) Phosphotriose isomerase

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Question 444

The pathogenesis of diabetic cataract involves accumulation of?

A) Galactose B) Mannitol C) Sorbitol D) Pyruvate

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Question 445

Insulin has no effect on the activity of the enzyme?

A) Glycogen synthetase B) Fructokinase C) Pyruvate kinase D) Pyruvate dehydrogenase

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Question 446

A specific fructokinase present in liver has a very high affinity for its substrate because?

A) Km for fructose is very high B) Km for fructose is very low C) Activity is affected by fasting D) Activity is affected by insulin

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Question 447

Conversion of fructose to sorbitol is catalysed by the enzyme?

A) Sorbitol dehydrogenase B) Aldose reductase C) Fructokinase D) Hexokinase

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Question 448

The best known cause of galactosemia is the deficiency of?

A) Galactose 1-phosphate and uridyl transferase B) Phosphoglucomutase C) Galactokinase D) Lactose synthase

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Question 449

Galactose 1-phosphate is converted to uridine diphosphate galactose, the reaction is catalysed by the enzyme?

A) Glactokinase B) Galactose 1-phosphate uridyl transferase C) Uridine diphospho galactose 4-epimerase D) UDP glucose pyrophosphorylase

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Question 450

Galactose is readily converted to glucose in?

A) Liver B) Intestine C) Kidney D) Adipose tissue

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