The structure shown below is of (A) Cholecalciferol (B) 25-Hydroxycholecalciferol (C) Ergocalciferol (D) 7-Dehydrocholesterol

The structure shown below is of (A) Cholecalciferol (B) 25-Hydroxycholecalciferol (C) Ergocalciferol (D) 7-Dehydrocholesterol
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Calcitriol inhibits the conversion of (A) Cholesterol into 7-dehydrocholesterol (B) Cholecalciferol into 1-hydroxycholecalciferol (C) Cholecalciferol into 25-hydroxycholecalciferol (D) 25-Hydroxycholecalciferol into 1,25- dihydroxycholecalciferol

Description : Calcitriol inhibits the conversion of (A) Cholesterol into 7-dehydrocholesterol (B) Cholecalciferol into 1-hydroxycholecalciferol (C) Cholecalciferol into 25-hydroxycholecalciferol (D) 25-Hydroxycholecalciferol into 1,25- dihydroxycholecalciferol

Last Answer : Answer : D

Parathormone is required for the conversion of (A) Cholecalciferol into 1-hydroxycholecalciferol (B) Cholecalciferol into 25-hydroxycholecalciferol (C) 25-Hydroxycholecalciferol into calcitriol (D) Cholesterol into 7-dehydrocholesterol

Description : Parathormone is required for the conversion of (A) Cholecalciferol into 1-hydroxycholecalciferol (B) Cholecalciferol into 25-hydroxycholecalciferol (C) 25-Hydroxycholecalciferol into calcitriol (D) Cholesterol into 7-dehydrocholesterol

Last Answer : Answer : C

A provitamin D synthesized in human beings is (A) Ergosterol (B) 7-Dehydrocholesterol (C) Cholecalciferol (D) 25-Hydroxycholecalciferol

Description : A provitamin D synthesized in human beings is (A) Ergosterol (B) 7-Dehydrocholesterol (C) Cholecalciferol (D) 25-Hydroxycholecalciferol

Last Answer : Answer : B

The most potent Vitamin D metabolite is (A) 25-Hydroxycholecalciferol (B) 1,25-Dihydroxycholecalciferol (C) 24, 25-Dihydroxycholecalciferol (D) 7-Dehydrocholesterol

Description : The most potent Vitamin D metabolite is (A) 25-Hydroxycholecalciferol (B) 1,25-Dihydroxycholecalciferol (C) 24, 25-Dihydroxycholecalciferol (D) 7-Dehydrocholesterol

Last Answer : Answer : B

One international unit (I.U) of vitamin D is defined as the biological activity of (A) 0.025 µg of cholecalciferol (B) 0.025 µg of 7-dehydrocholecalciferol (C) 0.025 µg of ergosterol (D) 0.025 µg of ergocalciferol VITAMINS 113

Description : One international unit (I.U) of vitamin D is defined as the biological activity of (A) 0.025 µg of cholecalciferol (B) 0.025 µg of 7-dehydrocholecalciferol (C) 0.025 µg of ergosterol (D) 0.025 µg of ergocalciferol VITAMINS 113

Last Answer : Answer : A

The most potent Vitamin D metabolite is (A) 25-Hydroxycholecalciferol (B) 1,25-Dihydroxycholecalciferol (C) 24, 25-Dihydroxycholecalciferol (D) 7-Dehydrocholesterol

Description : The most potent Vitamin D metabolite is (A) 25-Hydroxycholecalciferol (B) 1,25-Dihydroxycholecalciferol (C) 24, 25-Dihydroxycholecalciferol (D) 7-Dehydrocholesterol

Last Answer : (B) 1,25-Dihydroxycholecalciferol

Tubular reabsorption of calcium is increased by (A) Cholecalciferol (B) 25-Hydroxycholecalciferol (C) Calcitriol (D) All of these

Description : Tubular reabsorption of calcium is increased by (A) Cholecalciferol (B) 25-Hydroxycholecalciferol (C) Calcitriol (D) All of these

Last Answer : Answer : C

Provitamin D3 is (A) Cholecalciferol (B) Ergosterol (C) 7-Dehydrocholesterol (D) Ergocaliferol

Description : Provitamin D3 is (A) Cholecalciferol (B) Ergosterol (C) 7-Dehydrocholesterol (D) Ergocaliferol

Last Answer : Answer : C

The β-ring of 7-dehydrocholesterol is cleaved to form cholecalciferol by (A) Infrared light (B) Dim light (C) Ultraviolet irridation with sunlight (D) Light of the tube lights

Description : The β-ring of 7-dehydrocholesterol is cleaved to form cholecalciferol by (A) Infrared light (B) Dim light (C) Ultraviolet irridation with sunlight (D) Light of the tube lights

Last Answer : Answer : C

A metabolite which is common to pathways of cholesterol biosynthesis from acetyl-CoA and cholecalciferol formation from cholesterol is (A) Zymosterol (B) Lumisterol (C) Ergosterol (D) 7 Dehydrocholesterol

Description : A metabolite which is common to pathways of cholesterol biosynthesis from acetyl-CoA and cholecalciferol formation from cholesterol is (A) Zymosterol (B) Lumisterol (C) Ergosterol (D) 7 Dehydrocholesterol

Last Answer : Answer : D

The most active form of Vitamin D is (A) 25-Hydroxycholecalciferol (B) 1, 25-dihydroxycholecalciferol (C) 25-dihydroxyergocalciferol (D) None of these

Description : The most active form of Vitamin D is (A) 25-Hydroxycholecalciferol (B) 1, 25-dihydroxycholecalciferol (C) 25-dihydroxyergocalciferol (D) None of these

Last Answer : Answer : A

The normal serum concentration of 25-hydroxycholecalciferol in ng/ml is (A) 0–8 (B) 60–100 (C) 100–150 (D) 8–55

Description : The normal serum concentration of 25-hydroxycholecalciferol in ng/ml is (A) 0–8 (B) 60–100 (C) 100–150 (D) 8–55

Last Answer : Answer : D

The active transport of ‘Ca’ is regulated by __________ which is synthesized in kidnyes. (A) Cholecalciferol (B) Ergosterol (C) 25-OH cholecalciferol (D) 1, 25-di OH-Cholecalciferol

Description : The active transport of ‘Ca’ is regulated by __________ which is synthesized in kidnyes. (A) Cholecalciferol (B) Ergosterol (C) 25-OH cholecalciferol (D) 1, 25-di OH-Cholecalciferol

Last Answer : Answer : D

Hydroxylation of 25-hydroxy cholecalciferol is promoted by (A) Cytochrome A (B) Panthyroid hormone (C) Cytochrome b (D) cAMP

Description : Hydroxylation of 25-hydroxy cholecalciferol is promoted by (A) Cytochrome A (B) Panthyroid hormone (C) Cytochrome b (D) cAMP

Last Answer : Answer : B

Calcitriol is (A) 1-hydroxy cholecalciferol (B) 25-hydroxy cholecalciferol (C) 24, 25-dihydroxy cholecalciferol (D) 1, 25-dihydroxy cholecalciferol

Description : Calcitriol is (A) 1-hydroxy cholecalciferol (B) 25-hydroxy cholecalciferol (C) 24, 25-dihydroxy cholecalciferol (D) 1, 25-dihydroxy cholecalciferol

Last Answer : Answer : D

Hydroxylation of 25-hydroxy cholecalciferol is promoted by (A) Cytochrome - a (B) Parathyroid hormone (C) Cytochrome-b (D) CAMP

Description : Hydroxylation of 25-hydroxy cholecalciferol is promoted by (A) Cytochrome - a (B) Parathyroid hormone (C) Cytochrome-b (D) CAMP

Last Answer : Answer : B

Calcitriol is (A) 1-OH-cholecalciferol (B) 25-OH-cholecalciferol (C) 24, 25-diOH cholecalciferol (D) 1, 25-diOH cholecalciferol

Description : Calcitriol is (A) 1-OH-cholecalciferol (B) 25-OH-cholecalciferol (C) 24, 25-diOH cholecalciferol (D) 1, 25-diOH cholecalciferol

Last Answer : Answer : D

Steroid hormones are synthesised from (A) Cholesterol (B) 7-Dehydrocholesterol (C) Calcitriol (D) 7-Hydroxycholesterol

Description : Steroid hormones are synthesised from (A) Cholesterol (B) 7-Dehydrocholesterol (C) Calcitriol (D) 7-Hydroxycholesterol

Last Answer : Answer : A

This interferes with cholesterol absorption (A) Lipoprotein lipase (B) Creatinase (C) 7-dehydrocholesterol (D) β-sitosterol

Description : This interferes with cholesterol absorption (A) Lipoprotein lipase (B) Creatinase (C) 7-dehydrocholesterol (D) β-sitosterol

Last Answer : Answer : D

Which one of the following drugs, when used chronically, is associated with the development of bone pain and mineralization defects such as osteomalacia? (a) Calcitonin (b) Dihydrotachysterol (c) Ergocalciferol (d) Etidronate (e) Norgestrel

Description : Which one of the following drugs, when used chronically, is associated with the development of bone pain and mineralization defects such as osteomalacia? (a) Calcitonin (b) Dihydrotachysterol (c) Ergocalciferol (d) Etidronate (e) Norgestrel

Last Answer : Ans: D

Which one of the following enzymes requires a coenzyme derived from the vitamin whose structure is shown below? (A) Enoyl CoA hydratase (B) Phosphofructokinase (C) Glucose-6-phosphatase (D) Glucose-6-phosphate dehydrogenase

Description : Which one of the following enzymes requires a coenzyme derived from the vitamin whose structure is shown below? (A) Enoyl CoA hydratase (B) Phosphofructokinase (C) Glucose-6-phosphatase (D) Glucose-6-phosphate dehydrogenase

Last Answer : Answer : D

A high plasma calcium level decreases intestinal absorption of calcium by (A) Stimulating the secretion of parathormone (B) Inhibiting the secretion of parathormone (C) Decreasing the synthesis of cholecalciferol (D) Inhibiting the secretion of thyrocalcitonin

Description : A high plasma calcium level decreases intestinal absorption of calcium by (A) Stimulating the secretion of parathormone (B) Inhibiting the secretion of parathormone (C) Decreasing the synthesis of cholecalciferol (D) Inhibiting the secretion of thyrocalcitonin

Last Answer : Answer : B

This is photo labile vitamin: (A) Thiamine (B) Riboflavin (C) Niacin (D) Cholecalciferol

Description : This is photo labile vitamin: (A) Thiamine (B) Riboflavin (C) Niacin (D) Cholecalciferol

Last Answer : Answer : B

This is a photo-labile vitamin. (A) Thiamine (B) Riboflavin (C) Niacin (D) Cholecalciferol

Description : This is a photo-labile vitamin. (A) Thiamine (B) Riboflavin (C) Niacin (D) Cholecalciferol

Last Answer : Answer : C

Dictary deficiency of this vitamin leads to night blindness: (A) Retinol (B) Niacin (C) Ascorbic acid (D) Cholecalciferol VITAMINS 125

Description : Dictary deficiency of this vitamin leads to night blindness: (A) Retinol (B) Niacin (C) Ascorbic acid (D) Cholecalciferol VITAMINS 125

Last Answer : Answer : A

From a 3-dimensional structure made of cubes, eight rows of cubes have been removed as shown below. Select the correct pattern that will emerge from the side shown with an arrow.

Description : From a 3-dimensional structure made of cubes, eight rows of cubes have been removed as shown below. Select the correct pattern that will emerge from the side shown with an arrow. 

Last Answer : A

Corporate executives who work in top notch companies and travel to their offices in early morning in their air conditioned cars with tinted glasses spending their entire day in their cabins are prone to suffer from the deficiency of: (a) calcitonin (b) cynacobalamin (c) tocopherol (d) cholecalciferol.

Description : Corporate executives who work in top notch companies and travel to their offices in early morning in their air conditioned cars with tinted glasses spending their entire day in their cabins are prone ... from the deficiency of: (a) calcitonin (b) cynacobalamin (c) tocopherol (d) cholecalciferol.

Last Answer : Ans:(b)

The most suitable vitamin D preparation for vitamin D dependent rickets is: A. Calciferol B. Cholecalciferol C. Calcifediol D. Calcitriol

Description : The most suitable vitamin D preparation for vitamin D dependent rickets is: A. Calciferol B. Cholecalciferol C. Calcifediol D. Calcitriol

Last Answer : D. Calcitriol

Coenzymes derived from the vitamin shown below are required by which of the following enzymes? (A) Lactate dehydrogenase (B) Glutamate dehydrogenase (C) Pyruvate dehydrogenase (D) Malate dehydrogenase

Description : Coenzymes derived from the vitamin shown below are required by which of the following enzymes? (A) Lactate dehydrogenase (B) Glutamate dehydrogenase (C) Pyruvate dehydrogenase (D) Malate dehydrogenase

Last Answer : Answer : C

Coenzymes derived from the vitamin shown below are required by enzymes involved in the synthesis of which of the following? (A) ATP (B) UTP (C) CTP (D) NADH

Description : Coenzymes derived from the vitamin shown below are required by enzymes involved in the synthesis of which of the following? (A) ATP (B) UTP (C) CTP (D) NADH

Last Answer : Answer : A

In the figures shown below, fructose 1,6- biphosphate is located at point: (A) A (B) B (C) C (D) D

Description : In the figures shown below, fructose 1,6- biphosphate is located at point: (A) A (B) B (C) C (D) D

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The lines shown below are perpendicular. If the green line has a slope of 1/7, what is the slope of the red line?

Description : The lines shown below are perpendicular. If the green line has a slope of 1/7, what is the slope of the red line?

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How much distance (in cm) will the bicycle shown below travel, if the pedal makes 1.5 revolutions? (Assume π = 22/7).

Description : How much distance (in cm) will the bicycle shown below travel, if the pedal makes 1.5 revolutions? (Assume π = 22/7). 

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The Km of the enzyme giving the kinetic data as below is (A) –0.50 (B) –0.25 (C) +0.25 (D) +0.33

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Last Answer : Answer : D

After operative removal of the parathyroid glands resulting into hypoparathyroidism the concentration of the serum calcium may drop below (A) 11 mg (B) 10 mg (C) 9 mg (D) 7 mg

Description : After operative removal of the parathyroid glands resulting into hypoparathyroidism the concentration of the serum calcium may drop below (A) 11 mg (B) 10 mg (C) 9 mg (D) 7 mg

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