biochemistry Mcqs
151. Phosphofructokinase is the key enzyme of______________?
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A. Gluconeogenesis

B. Glycolysis

C. Beta oxidation

D. TCA cycle

154. Which of the following is not a second messenger ?
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A. c GMP

B. Phosphatidyl glycerol

C. Phosphatidyl inosital

D. c AMP

156. Cane sugar is____________?
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A. Surose

B. Glucose

C. Fructose

D. Maltose

157. Kinase requires_______________?
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A. Inorganic phosphate

B. Mg++

C. Cu++

D. MN++

159. Urea is formed in_____________?
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A. Liver

B. Brain

C. Kidney

D. Intestine

160. Acetyl CoA is produced from which fuel sources_____________?
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A. Amino acids

B. Carbohydrate

C. All of the above

D. Lipid

161. Sources of the nucleotide portion of NAD include__________________?
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A. Tryptophan

B. N-methyl nicotinamide

C. Riboflavin

D. PRPP

163. On complete hydrolysis of DNA we will get all the following except______________?
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A. Deoxy pentose sugar

B. Phosphoric acid

C. Purine bases

D. Adenosine
164. Major source of ammonia in the kidney is___________?
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A. Aspartate

B. Glutamate

C. Glutamine

D. Urea Aspartate

165. Vitamin C effects_________________?
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A. Maturation of procollagen

B. Formation of osteoid matrix

C. Calcification of osteoid

D. Both A and B
167. The major lipids that make up the cell membrane are_______________?
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A. Triglycerides

B. Phospholipids

C. Fatty acids

D. Sphingomyelins

168. In Hartnups disease _______ is excreted in the urine?
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A. Phenylalanine

B. Tryptophan

C. Ornithine

D. Glutamine

169. The amino acid from which niacin synthesized is_______________?
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A. Threonine

B. Tryptophan

C. Tyrosine

D. Histidine

170. The precursor of cholesterol synthesis is________________?
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A. Pyruvate

B. Acetyl CoA

C. Oxalo acetic acid

D. Acetic acid

171. Ascorbic acid_____________?
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A. Is requirement for lysyl oxidase

B. Is harmless in high doses

C. Is a reducing agent

D. Decrease iron absorption

172. Proteins are absorbed from GIT as_____________?
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A. Amino acids

B. All of the above

C. Peptides

D. Peptones

173. Key enzyme in urea synthesis is____________?
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A. Arginase

B. Ornithine

C. Carbamyl synthetase

D. Urease

174. Pernicious anaemia occurs in___________?
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A. Vit C deficiency

B. Vit D deficiency

C. Vit B1 deficiency

D. Vit B12 deficiency
175. Which of the following is not a ketone body______________?
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A. Acetocetate

B. Acetone

C. Acetic acid

D. Beta hydroxybutyric acid

176. Xerophthalmia is caused by_______________?
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A. Vitamin K deficiency

B. Vitamin D deficiency

C. Vitamin A deficiency

D. Vitamin C deficiency

179. All are derived of cholesterol except________________?
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A. Glycocholic acid

B. Cholecystokinin

C. Chenodeoxy cholic acid

D. Testosterone

180. Lipid is required in the average diet because it________________?
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A. is necessary for storage of carbohydrates

B. Provides essential fatty acid

C. aids in absorption of carbohydrates

D. has a high caloric value

181. B-oxidation of odd-chain fatty aids produce_______________?
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A. Propionyl CoA

B. Acetyl CoA

C. Succinyl CoA

D. Malonyl CoA

182. Aniacinosis results in______________?
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A. Beri beri

B. Perleche

C. Nyctalopia

D. Pellagra
183. The precursor of steroid is_______________?
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A. Cholesterol

B. None of the above

C. Amino acids

D. Fatty acids

184. All are genetic amino acid deficiency disease except___________?
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A. 6alactosemia

B. Alkaptonuria

C. Homocystinuria

D. Phenyl ketonuria

185. Which of the following fatty acids are not syntehsised in human body_____________?
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A. Linoleic, arachidonic and stearic acid

B. Oleic, linoleic and linolenic acid

C. Arachidonic, linolenic and linoleic acid

D. Palmitic Oleic and arachidonic

187. Histidine is converted to histamine by_____________?
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A. Transamination

B. Hydroxylation

C. Reduction

D. Decarboxylation
188. Detoxification of drugs is controlled by_____________?
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A. Cytochrome P450

B. Cytochrome A

C. Cytochrome

D. Cytochrome C

189. The major fuel for the brain after several weeds of starvation______________?
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A. Glucose

B. Fatty acid

C. Beta hydroxy butyrate

D. Glycerol

191. Examples of monounsaturted fatty acids are______________?
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A. Linolenic acid

B. Oleic acid

C. Palmitic acid

D. Arachitlonic acid

192. Indole ring is present in______________?
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A. Tryptophan

B. Methionine

C. Valine

D. Histidine

193. Iron absorption is decreased in presence of all except____________?
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A. Phosphates

B. Ascorbic acid

C. Tannins

D. Phytates

194. Chargaff rule states that___________?
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A. A+G=T+C

B. A+T=G+C

C. A/T=G/C

D. A=U=T=G=C

196. The following is false about tryptophan_____________?
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A. Non-essential amino acid

B. Involved in serotonin synthesis

C. Involved in melatonin in synthesis

D. Involved in niacin synthesis

197. The normal range of serum osmolality (in mosm/L) is_____________?
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A. 350 to 375

B. 300 to 320

C. 280 to 295

D. 200 to 250

198. Enzymes increase reaction rates by______________?
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A. Decreasing the energy of activation

B. Enhancing the forward reaction

C. Altering the free energy of the action

D. Inhibiting the backward reaction

199. All are true of the genetic code except____________?
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A. Non overlapping

B. Universal

C. Punctuation

D. Degenerate

200. Iron is present in all, EXCEPT______________?
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A. Pyruvate kinase

B. Myoglobin

C. Catalase

D. Cytochrome