Introduction to Biochemistry Mcqs

Introduction to Biochemistry Mcqs

1. A drug which prevents uric acid synthesis

by inhibiting the enzyme xanthine

oxidase is

(A) Aspirin (B) Allopurinol

(C) Colchicine (D) Probenecid

2. Which of the following is required for

crystallization and storage of the

hormone insulin?

(A) Mn++ (B) Mg++

(C) Ca++ (D) Zn++

3. Oxidation of which substance in the body

yields the most calories

(A) Glucose (B) Glycogen

(C) Protein (D) Lipids

4. Milk is deficient in which vitamins?

(A) Vitamin C (B) Vitamin A

(C) Vitamin B2 (D) Vitamin K

5. Milk is deficient of which mineral?

(A) Phosphorus (B) Sodium

(C) Iron (D) Potassium

6. Synthesis of prostaglandinsis is inhibited


(A) Aspirin (B) Arsenic

(C) Fluoride (D) Cyanide

7. HDL is synthesized and secreted from

(A) Pancreas (B) Liver

(C) Kidney (D) Muscle

8. 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

9. 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

10. 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


11. 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


(D) The hydrocarbon chain of cholesterol projects

into the extracellular fluid

12. Which one is the heaviest particulate

component of the cell?

(A) Nucleus (B) Mitochondria

(C) Cytoplasm (D) Golgi apparatus

13. Which one is the largest particulate of the


(A) Lysosomes

(B) Mitochondria

(C) Golgi apparatus

(D) Entoplasmic reticulum

14. The degradative Processess are categorized

under the heading of

(A) Anabolism (B) Catabolism

(C) Metabolism (D) None of the above

15. The exchange of material takes place

(A) Only by diffusion

(B) Only by active transport

(C) Only by pinocytosis

(D) All of these

16. The average pH of Urine is

(A) 7.0 (B) 6.0

(C) 8.0 (D) 0.0

17. The pH of blood is 7.4 when the ratio

between H2CO3 and NaHCO3 is

(A) 1 : 10 (B) 1 : 20

(C) 1 : 25 (C) 1 : 30

18. The phenomenon of osmosis is opposite

to that of

(A) Diffusion (B) Effusion

(C) Affusion (D) Coagulation

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

20. Which of the following is located in the


(A) Cytochrome oxidase

(B) Succinate dehydrogenase

(C) Dihydrolipoyl dehydrogenase

(C) All of these

21. The most active site of protein synthesis

is the

(A) Nucleus (B) Ribosome

(C) Mitochondrion (D) Cell sap

22. The fatty acids can be transported into

and out of mitochondria through

(A) Active transport

(B) Facilitated transfer

(C) Non-facilitated transfer

(D) None of these

23. Mitochondrial DNA is

(A) Circular double stranded

(B) Circular single stranded

(C) Linear double helix

(D) None of these

24. The absorption of intact protein from the

gut in the foetal and newborn animals

takes place by

(A) Pinocytosis (B) Passive diffusion

(C) Simple diffusion (D) Active transport

25. The cellular organelles called “suicide

bags” are

(A) Lysosomes (B) Ribosomes

(C) Nucleolus (D) Golgi’s bodies

26. From the biological viewpoint, solutions

can be grouped into

(A) Isotonic solution

(B) Hypotonic solutions

(C) Hypertonic solution

(D) All of these

27. Bulk transport across cell membrane is

accomplished by

(A) Phagocytosis (B) Pinocytosis

(C) Extrusion (D) All of these

28. The ability of the cell membrane to act as

a selective barrier depends upon

(A) The lipid composition of the membrane

(B) The pores which allows small molecules

(C) The special mediated transport systems

(D) All of these

29. Carrier protein can

(A) Transport only one substance

(B) Transport more than one substance

(C) Exchange one substance to another

(D) Perform all of these functions

30. A lipid bilayer is permeable to

(A) Urea (B) Fructose

(C) Glucose (D) Potassium

31. The Golgi complex

(A) Synthesizes proteins

(B) Produces ATP

(C) Provides a pathway for transporting chemicals

(D) Forms glycoproteins

32. The following points about microfilaments

are true except

(A) They form cytoskeleton with microtubules

(B) They provide support and shape

(C) They form intracellular conducting channels

(D) They are involved in muscle cell contraction

33. The following substances are cell

inclusions except

(A) Melanin (B) Glycogen

(C) Lipids (D) Centrosome

34. Fatty acids can be transported into and

out of cell membrane by

(A) Active transport (B) Facilitated transport

(C) Diffusion (D) Osmosis

35. Enzymes catalyzing electron transport

are present mainly in the

(A) Ribosomes

(B) Endoplasmic reticulum

(C) Lysosomes

(D) Inner mitochondrial membrane

36. Mature erythrocytes do not contain

(A) Glycolytic enzymes(B) HMP shunt enzymes

(C) Pyridine nucleotide(D) ATP

37. In mammalian cells rRNA is produced

mainly in the

(A) Endoplasmic reticulum

(B) Ribosome

(C) Nucleolus

(D) Nucleus

38. Genetic information of nuclear DNA is transmitted to the site of protein synthesis by

(A) rRNA (B) mRNA

(C) tRNA (D) Polysomes

39. The power house of the cell is

(A) Nucleus (B) Cell membrane

(C) Mitochondria (D) Lysosomes

40. The digestive enzymes of cellular

compounds are confined to

(A) Lysosomes (B) Ribosomes

(C) Peroxisomes (D) Polysomes

Introduction to Biochemistry Mcqs

Introduction to Biochemistry Mcqs