Introduction To Biochemistry Set 1

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Biochemistry (Introduction Set 1)

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1. Synthesis of prostaglandins is is inhibited
by

A) Aspirin

B) Arsenic

C) Fluoride

D) Cyanide

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2. Which one is the largest particulate of the
cytoplasm?

A) Lysosomes

B) Mitochondria

C) Golgi apparatus

D) Entoplasmic reticulum

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3. Which of the following is required for crystallization and storage of the
hormone insulin?

A) Mn++

B) Mg++

C) Ca++

D) Zn++

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4. Which of the following is located in the
mitochondria?

A) Cytochrome oxidase

B) Succinate dehydrogenase

C) Dihydrolipoyl dehydrogenase

D) All of these

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5. Which of the following statement is correct about membrane cholesterol?

A) The hydroxyl group is located near the centre of the lipid layer

B) Most of the cholesterol is in the form of a cholesterol ester

C) The steroid nucleus form forms a rigid, planar structure

D) The hydrocarbon chain of cholesterol projects into the extracellular fluid

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6. All the following processes occur rapidly in the membrane lipid bilayer except

A) Flexing of fatty acyl chains

B) Lateral diffusion of phospholipids

C) Transbilayer diffusion of phopholipids

D) Rotation of phospholipids around their long axes

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7. Which are the cholesterol esters that enter cells through the receptor-mediated
endocytosis of lipoproteins hydrolyzed?

A) Endoplasmin reticulum

B) Lysosomes

C) Plasma membrane receptor

D) Mitochondria

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8. A drug which prevents uric acid synthesis by inhibiting the enzyme xanthine oxidase is

A) Aspirin

B) Allopurinol

C) Colchicine

D) Probenecid

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9. Milk is deficient in which vitamins?

A) Vitamin C

B) Vitamin A

C) Vitamin B2

D) Vitamin K

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10. HDL is synthesized and secreted from

A) Pancreas

B) Liver

C) Kidney

D) Muscle

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11. Oxidation of which substance in the body
yields the most calories

A) Glucose

B) Glycogen

C) Protein

D) Lipids

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12. Which one is the heaviest particulate
component of the cell?

A) Nucleus

B) Mitochondria

C) Cytoplasm

D) Golgi apparatus

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13. The phenomenon of osmosis is opposite
to that of

A) Diffusion

B) Effusion

C) Affusion

D) Coagulation

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14. Which of the following phospholipids is localized to a greater extent in the outer
leaflet of the membrane lipid bilayer?

A) Choline phosphoglycerides

B) Ethanolamine phosphoglycerides

C) Inositol phosphoglycerides

D) Serine phosphoglycerides

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15. The degradative Processess are categorized
under the heading of

A) Anabolism

B) Catabolism

C) Metabolism

D) None of the above

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16. The average pH of Urine is

A) 7.0

B) 6.0

C) 8.0

D) 0.0

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17. The exchange of material takes place

A) Only by diffusion

B) Only by active transport

C) Only by pinocytosis

D) All of these

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18. The pH of blood is 7.4 when the ratio between H2CO3 and NaHCO3 is

A) 1 : 10

B) 1 : 20

C) 1 : 25

D) 1 : 30

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19. The surface tension in intestinal lumen between fat droplets and aqueous
medium is decreased by

A) Bile Salts

B) Bile acids

C) Conc. H2SO4

D) Acetic acid

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20. Milk is deficient of which mineral?

A) Phosphorus

B) Sodium

C) Iron

D) Potassium

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Introduction To Biochemistry Set 1

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