Introduction To Biochemistry Set 1

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Biochemistry (Introduction Set 1)

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1. 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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2. The average pH of Urine is

A) 7.0

B) 6.0

C) 8.0

D) 0.0

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3. Synthesis of prostaglandins is is inhibited
by

A) Aspirin

B) Arsenic

C) Fluoride

D) Cyanide

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4. 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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5. Oxidation of which substance in the body
yields the most calories

A) Glucose

B) Glycogen

C) Protein

D) Lipids

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

A) Nucleus

B) Mitochondria

C) Cytoplasm

D) Golgi apparatus

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7. 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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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. 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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10. Milk is deficient of which mineral?

A) Phosphorus

B) Sodium

C) Iron

D) Potassium

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11. 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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12. 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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13. 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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14. Milk is deficient in which vitamins?

A) Vitamin C

B) Vitamin A

C) Vitamin B2

D) Vitamin K

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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 phenomenon of osmosis is opposite
to that of

A) Diffusion

B) Effusion

C) Affusion

D) Coagulation

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17. 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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18. Which one is the largest particulate of the
cytoplasm?

A) Lysosomes

B) Mitochondria

C) Golgi apparatus

D) Entoplasmic reticulum

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19. HDL is synthesized and secreted from

A) Pancreas

B) Liver

C) Kidney

D) Muscle

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20. 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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Introduction To Biochemistry Set 1

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