biochemistry MCQs – Page 11

Practise focused biochemistry questions with marked answers for exam preparation and subject revision.

biochemistry Mcqs
201. In maple syrup urine disease the amino acids excreted in the urine are______________?
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A. Leucine

B. Isoleucine

C. All of the above

D. Valine

202. Which of the following is the best site of absorption of calcium ?
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A. Ascending colon

B. Proximal segment of small intestine

C. Middle segment of small intestine

D. Ileum

203. DNA double helix is bound by_____________?
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A. Covalent bond

B. Vander wall forces

C. Disulfide linkage

D. Hydrogen bond
204. In the physiological system, nitric oxide is known to act through_______________?
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A. Calcium ions

B. Cyclic GMP

C. Prostacyclins

D. Cyclic AMP

205. Thiamine deficiency can be diagnosed by measuring________________?
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A. Alkaline phosphatase levels in blood

B. Plasma pyruvate and lactic acid levels

C. Thiamine levels in blood

D. Transketolase activity in RBC
206. Cholesterol levels in abnormal person should be preferably less than_____________?
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A. 180 mg/dl

B. 150 mg/dl

C. 120 mg/dl

D. 200 mg/dl
207. Albumins and globulins are ________ proteins?
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A. Peptones

B. Prolamines

C. Lactalbumin

D. Simple
208. Cytochromes are_____________?
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A. Metal containing flavoproteins

B. Iron-porphyrin proteins

C. Pyridine nucleotides

D. Riboflavin containing nucleotides

209. One of the following is nonessential amino acid______________?
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A. Cystine

B. Valine

C. Methionine

D. Tyrosine
210. Which of these is not included in parenteral therapy ?
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A. Carbohydrates

B. Fibres

C. Fats

D. Micronutrients

211. Biotin is required for the activity of_______________?
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A. Lactate dehydrogenase

B. Phosphohexose isomerase

C. Pyruvate carboxylase

D. Succinate thiokinase

212. The lipid, which acumulates in fatty liver, is_______________?
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A. Lipoprotein

B. FFA

C. Triglycerides

D. Cholesterol

213. Glycine is present in____________?
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A. Purines

B. Creatine

C. All of the above

D. Glutathione

E. Hemoglobin

214. Non essential amino acids are not_____________?
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A. Required in the diet

B. Used by the body

C. Absorbed in the intestines

D. Forming part of the proteins

215. The total blood concentration of ketone bodies in well fed individual is__________?
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A. 20 mg%

B. 5 mg%

C. 12 mg%

D. 1 mg%
216. Within the RBC hypoxia stimulates glycolysis by which of the following regulating pathways ?
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A. Hypoxia inhibits hexokinase

B. Hypoxia stimulates release of all glycolytic enzymes from Band 3 on RBC membrane

C. Activation of the regulatory enzymes by high PH

D. Hypoxia stimulates pyruvate dehydrogenase by increased, 2, 3DPG

217. Enzyme regulating the conversion of ethanol to acetaldehyde________________?
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A. Acetaldehyde dehydrogenase

B. Catalase

C. Alcohol dehydrogenase

D. Enolase

218. True about denaturation of protein is all except______________?
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A. Disruption of secondary structure occurs

B. Biological activity is retained

C. Unfolding occurs

D. Sequence of amino acids remain the same

219. Angular cheilosis is frequently associated with deficiency of______________?
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A. Riboflavin

B. Folic acid

C. Niacin

D. Thiamine

220. The initiation codon for protein synthesis is_____________?
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A. AUG

B. UUU

C. UAA

D. UAG