Vitamin A or retinal is a (A) Steroid (B) Polyisoprenoid compound containing a cyclohexenyl ring (C) Benzoquinone derivative (D) 6-Hydroxychromane

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Answer :

Answer : B

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Description : Vitamin A or retinal is a (A) Steroid (B) Polyisoprenoid compound containing a cyclohexenyl ring (C) Benzoquinone derivative (D) 6-Hydroxychromane

Last Answer : (B) Polyisoprenoid compound containing a cyclohexenyl ring

Description : Which one of the following statements is not correct? (a) Retinal is the light absorbing portion of visual photopigments. (b) In retina the rods have the photopigment rhodopsin while cones have three ... a derivative of vitamin C. (d) Rhodopsin is the purplish red protein present in rods only.

Last Answer : (c) Retinal is a derivative of vitamin C.

Description : Good vision depends on adequate intake of carotene rich food. Select the best option from the following statements. (1) Vitamin A derivatives are formed from carotene. (2) The photopigments are embedded in the membrane discs of the inner ... (1) and (3) (c) (2), (3) and (4) (d) (1) and (2)

Last Answer : (b) (1) and (3)

Description : Good vision depends on adequate intake of carotene rich food : Select the best option from the following statements : (a) Vitamin A derivatives are formed from carotene (b) The photopigments are embedded in the membrane discs of the inner segment ... (a) and (c) (3) (b), (c) and (d) (4) (a) and (b)

Last Answer : (1) (a), (c) and (d)

Description : The cholesterol molecule is (A) Benzene derivative (B) Quinoline derivative (C) Steroid (D) Straight chain acid

Last Answer : Answer : C

Description : FAD containing enzyme, catalyzing formation of α, β unsaturated fatty acyl CoA derivative. (A) Acyl CoA dehydrogenase (B) Enoyl hydrase (C) β-OH acyl CoA dehydrogenase (D) Thiolase

Last Answer : Answer : A

Description : In retinal rickets, the following hydroxylation of Vitamin D3 does not take place: (A) 25 (B) 1 (C) 24 (D) 7

Last Answer : Answer : B

Description : The oxidation of lactic acid to pyruvic acid requires the following vitamin derivative as the hydrogen carrier. (A) Lithium pyrophosphate (B) Coenyzme A (C) NAD+ (D) FMN

Last Answer : C

Description : Steroid hormones are synthesized from (A) Adenine (B) Protein (C) Vitamin (D) Cholesterol

Last Answer : Answer : D

Description : The phospholipids present in cytoplasm of eubacteria is mainly A- phosphoglycerides B- polyisoprenoid C- phospholipoprotein D- non of these

Last Answer : phosphoglycerides

Description : The phospholipids present in cytoplasm membrane of the archaeo- bacteria is A- phosphoglycerides B- polyisoprenoid C- polyisoprenoid branched chain lipids D- none of the bove

Last Answer : polyisoprenoid branched chain lipids

Description : Aniline undergoes oxidation with Na2Cr2O7/H2SO4 to give (a) Schiff's base (b) p-Benzoquinone (c) Phenol (d) Benzoic acid

Last Answer : p-Benzoquinone

Description : The following is not true of the cytochrome P450 isoenzyme CYP2D6: A. It generates the hepatotoxic metabolite N-acetyl benzoquinone immine from paracetamol B. It is involved in demethylation of ... for poor capacity to hydroxylate many drugs including metoprolol D. It is inhibited by quinidine

Last Answer : A. It generates the hepatotoxic metabolite N-acetyl benzoquinone immine from paracetamol

Description : The following is not true of the cytochrome P450 isoenzyme CYP2D6: A. It generates the hepatotoxic metabolite N-acetyl benzoquinone immine from paracetamol B. It is involved in demethylation of ... for poor capacity to hydroxylate many drugs including metoprolol D. It is inhibited by quinidine

Last Answer : A. It generates the hepatotoxic metabolite N-acetyl benzoquinone immine from paracetamo

Description : Characteristics of Vitamin D and its metabolites include which one of the following? (a) Act to decrease serum levels of calcium (b) Activation of their Vitamin D receptors increases cellular CAMP ... Vitamin D increase renal excretion of calcium (e) Vitamin D deficiency results in Pager's disease

Last Answer : Ans: C

Description : Which is a steroid vitamin?

Last Answer : Vitamin D

Description : Photosensitive compound in human eye is made up of (a) opsin and retinol (b) transducin and retinene (c) guanosine and retinol (d) opsin and retinal.

Last Answer : (d) opsin and retinal.

Description : The co-enzyme containing an automatic hetero ring in the structure is (A) Biotin (B) TPP (C) Sugar Phosphate (D) Co-enzyme

Last Answer : Answer : C

Description : A coenzyme containing aromatic hetero ring is (A) TPP (B) Lipoic acid (C) Coenzyme Q (D) Biotin

Last Answer : Answer : A

Description : A coenzyme containing non aromatic hetero ring is (A) ATP (B) NAD (C) FMN (D) Biotin

Last Answer : Answer : D

Description : The amino acid containing an indole ring: (A) Tryptophan (B) Arginine (C) Threonine (D) Phenylalanine

Last Answer : Answer : A

Description : The structure of the compound that gives a tribromo derivative on treatment with bromine water is `:`

Last Answer : The structure of the compound that gives a tribromo derivative on treatment with bromine water is `:` A. B. C. D.

Description : The Hinsberg test of a `C_(5)H_(14)N_(2)` compound produces a solid that is insoluble in 10% aq. `NaOH`. This solid derivative dissolves in `10%` aq.

Last Answer : The Hinsberg test of a `C_(5)H_(14)N_(2)` compound produces a solid that is insoluble in 10% aq. `NaOH` ... would best fit these facts ? A. B. C. D.

Description : The sulphur containing vitamins among the following B Vitamin is (A) Thiamine (B) Riboflavin (C) Niacin (D) Pyridoxine

Last Answer : Answer : A

Description : The sulphur-containing vitamins among the following B-Vitamin is (A) Thiamine (B) Riboflavin (C) Niacin (D) Pyridoxine

Last Answer : Answer : A

Description : A diet containing this fat is helpful in lowering the blood cholesterol level. (A) Unsaturated (B) Saturated (C) Vitamin enriched (D) Refined

Last Answer : Answer : A

Description : The molecule of vitamin A1 contains (A) Benzene ring (B) β-Ionone ring (C) β-Carotene ring (D) None of these

Last Answer : Answer : B

Description : Vitamin B12 has a complex ring structure (corrin ring) consisting of four (A) Purine rings (B) Pyrimidine rings (C) Pyrrole rings (D) Pteridine rings

Last Answer : Answer : C

Description : The Vitamin which does not contain a ring in the structure is (A) Pantothenic acid (B) Vitamin D (C) Riboflavin (D) Thiamin

Last Answer : Answer : A

Description : The non-protein part of rhodopsin is (A) Retinal (B) Retinol (C) Carotene (D) Repsin

Last Answer : Answer : A

Description : Retinal exists as an ester with higher fatty acids in the (A) Liver (B) Kidney (C) Lung (D) All of these

Last Answer : Answer : D

Description : Retinal is reduced to retinol by retinene reductase in presence of the coenzyme (A) NAD+ (B) NADP+ (C) NADH + H+ (D) NADPH + H+

Last Answer : Answer : C

Description : Prosthetic group in cone cell phototreceptors is (A) Iodine (B) Opsin (C) 11-cis-retinal (D) all-trans-retinal

Last Answer : Answer : C

Description : Provitamins A include (A) Retinal (B) Retionic acid (C) Carotenes (D) All of these

Last Answer : Answer : C

Description : Conversion of all-trans-retinal into alltrans-retinol requires (A) NAD (B) NADH (C) NADP (D) NADPH

Last Answer : Answer : D

Description : When light falls on rod cells (A) All-cis-retinal is converted into all-trans-retinal (B) 11-cis-retinal is converted into 11-trans-retinal (C) 11-trans-retinal is converted into all-transretinal (D) 11-cis-retinal is converted into all-trans-retinal

Last Answer : Answer : D

Description : Rhodopsin contains opsin and (A) 11-cis-retinal (B) 11-trans-retinal (C) All-cis-retinal (D) All trans-retinal

Last Answer : Answer : A

Description : Retinal is converted into retinoic acid in the presence of (A) Retinal oxidase (B) Retinal carboxylase (C) Retinene reductase(D) Spontaneously

Last Answer : Answer : D

Description : Conversion of retinal into ritonal requires the presence of (A) NADH (B) NADPH (C) FADH2 (D) Lipoic acid

Last Answer : Answer : B

Description : Conversion of β-carotene into retinal requires the presence of (A) β-Carotene dioxygenase (B) Bile salts (C) Molecular oxygen (D) All of these

Last Answer : Answer : D

Description : On exposure to light rhodopsin forms (A) All trans-retinal (B) Cis-retinal (C) Retinol (D) Retinoic acid

Last Answer : Answer : A

Description : Retinal is a component of (A) Iodopsin (B) Rhodopsin (C) Cardiolipin (D) Glycoproteins

Last Answer : Answer : B

Description : Retinol and retinal are interconverted requiring dehydrogenase or reductase in the presence of (A) NAD or NADP (B) NADH + H+ (C) NADPH (D) FAD

Last Answer : Answer : A

Description : Retinal is reduced to retinol in intestinal mucosa by a specific retinaldehyde reductase utilising (A) NADPH + H+ (B) FAD (C) NAD (D) NADH + H+

Last Answer : Answer : A

Description : Non-protein part of rhodopsin is (A) Retinal (B) Retinol (C) Carotene (D) Repsin

Last Answer : Answer : A

Description : Conversion of fatty acyl-CoA to an acylCoA derivative having 2 more carbon atoms involves as acetyl donar: (A) Acetyl-CoA (B) Succinyl-CoA (C) Propionyl-CoA (D) Malonyl-CoA

Last Answer : Answer : D

Description : The cofactor or its derivative required for the conversion of acetyl CoA to malonylCoA is (A) FAD (B) ACP (C) NAD+ (D) Biotin

Last Answer : Answer : D

Description : Niacin or nicotinic acid is a monocarboxylic acid derivative of (A) Pyridine (B) Pyrimidine (C) Flavin (D) Adenine

Last Answer : Answer : A

Description : Long chain fatty acids penetrate the inner mitochondrial membrane (A) Freely (B) As acyl-CoA derivative (C) As carnitine derivative (D) Requiring Na dependent carrier

Last Answer : Answer : C

Description : Phenytoin: 1) is a benzalkonium Derivative 2) is clinically effective serum level is in the range on 2-10 micrograms/ml. 3) A steady state blood level is achieved by 2-5 days 4) Can be used in management of alchohol withdrawl syndrome 5) Is the drug of choice in absence seizures.

Last Answer : Answers-4 Phenytoin is an imidazolidine derivative.It relates to barbiturates in chemical structure. Clinically effective seum level is in the range on 10-20 micrograms/ml. A steady state blood level is achieved by 7-10 days.