XII Chemistry Biochemistry Online Test Mdcat-2024

Instructions for Biochemistry Online Test Mdcat-2024:

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Test Details:

Subject: Chemistry
Class: 2nd year or 12
Chapter name: Biochemistry
Topics : 1. Proteins 2. Carbohydrates 3. Lipids
Test: MDCAT 2024
Book: Sindh Textbook
Total No. Of MCQS: 60
Time Allowed: 50 Minutes

224

Created on June 05, 2024 By

medicoengineer.com

XII Chemistry Biochemistry Online Test Mdcat-2024

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NameEmailPhone Number

1 / 60

1. Which of the following is a primary function of proteins in the human body?

a) Provide energy storage

b) Act as a primary source of energy

c) Catalyze biochemical reactions

d) Store genetic information

2 / 60

2. Proteins are crucial for the structure and function of which of the following?

a) Cell walls in plants

b) Hemoglobin in blood

c) Glucose metabolism

d) Starch storage

3 / 60

3. Which type of protein is involved in the body's defense mechanisms?

a) Enzymes

b) Hormones

c) Antibodies

d) Structural proteins

4 / 60

4. Proteins play a vital role in which of the following processes?

a) Photosynthesis

b) Genetic coding

c) Muscle contraction

d) none

5 / 60

5. 1g of protein can provide approximately how much energy?

a) 4Kcal

b) 16.73 Joules

c) 9cal

d) 37.26 Joules

6 / 60

6. Which of the following is a transport protein?

a) Insulin

b) Myosin

c) immunoglobulin

d) Haemoglobin

7 / 60

7. Proteins are important for:

a) Immunological response

b) Transport of gases

c) Physiological Responses

d) All of these

8 / 60

8. Which of the following is NOT a property of proteins?

a) They can act as enzymes to catalyze biochemical reactions

b) They are the primary source of genetic information in cells.

c) They can function as hormones to regulate physiological processes.

d) They can form structural components of cells and tissues.

9 / 60

9. Which feature of amino acids in proteins contributes to their dipolar nature?

a) Presence of a nonpolar side chain

b) Presence of both an amino group and a carboxyl group

c) Presence of sulfur-containing side chains

d) Presence of a high molecular weight

10 / 60

10. Proteins are water soluble due to:

a) Amino Acid Chain rotation

b) Di polar terminal of amino acids in polypeptide chains

c) Amino acid sequence

d) None

11 / 60

11. What does it mean when a protein is described as amphoteric?

a) It can act as a buffer

b) It can function as both an enzyme and a substrate

c) It can act as both an acid and a base.

d) It can dissolve in both water and oil.

12 / 60

12. Which structural feature of proteins is responsible for their amphoteric nature?

a) The presence of hydrophobic side chains.

b) The presence of both amino and carboxyl groups.

c) The presence of aromatic rings.

d) The presence of disulfide bonds

13 / 60

13. Proteins exhibit flexibility due to:

a) The sequence of nucleotides

b) The ability of amino acid chain rotation

c) The presence of rigid β-sheets

d) The ability to form disulfide bonds

14 / 60

14. How does the amphoteric nature of proteins affect their behavior in different pH environments?

a) Proteins always remain neutral regardless of the pH.

b) Proteins can only act as acids in acidic environments.

c) Proteins can act as acids or bases depending on the pH.

d) Proteins become non-functional in highly acidic or basic environments.

15 / 60

15. Proteins are :

a) pH sensitive

b) Thermally unstable

c) Water insoluble

d) All of these

16 / 60

16. Example of Quaternary protein

a) Myoglobin

b) Trypsin

c) Insulin

d) None

17 / 60

17. Example of tertiary proteins.

a) All enzymes

b) Myoglobin

c) Insulin

d) A & B both

18 / 60

18. Which of the following best describes the tertiary structure of a protein?

a) The sequence of amino acids in a polypeptide chain.

b) The local folding patterns such as alpha helices and beta sheets

c) The overall three-dimensional shape of a single polypeptide chain.

d) The association of multiple polypeptide chains into a functional protein complex.

19 / 60

19. Which type of bond is primarily responsible for stabilizing the tertiary structure of proteins?

a) Peptide bonds

b) Hydrogen bonds

c) Disulfide bonds

d) Phosphodiester bonds

20 / 60

20. Which of the following interactions is NOT typically involved in maintaining the tertiary structure of proteins?

a) Hydrophobic interactions

b) Ionic interactions

c) Covalent bonds

d) Glycosidic bonds

21 / 60

21. Select the incorrect regarding secondary structure of proteins

a) It refers to the folding patterns in polypeptide chains due to interaction between amino acids

b) The two secondary common structures are alpha helix and beta sheets

c) Myoglobin is a secondary structure protein

d) Both A and B

22 / 60

22. Albumin, Globulin and Casein are

a) Storage proteins

b) Transport proteins

c) Hormonal proteins

d) None

23 / 60

23. Which of the following is not an catalytic protein.

a) Insulin

b) Amylase

c) Lipase

d) Protease

24 / 60

24. Which of the following is the primary function of catalytic proteins (enzymes)?

a) To provide structural support to cells

b) To transport molecules across membranes

c) To catalyze biochemical reactions by lowering the activation energy

d) To store genetic information

25 / 60

25. Which of the following is NOT a factor that can affect enzyme activity?

a) Temperature

b) pH

c) Substrate concentration

d) Atmospheric pressure

26 / 60

26. The region of an enzyme where substrate molecules bind and undergo a chemical reaction is known as the:

a) Active site

b) Allosteric site

c) Binding pocket

d) Catalytic core

27 / 60

27. Which type of enzyme inhibition occurs when an inhibitor binds to an enzyme at a site other than the active site, causing a change in the enzyme's shape and function?

a) Competitive inhibition

b) Non-competitive inhibition

c) Uncompetitive inhibition

d) Allosteric activation

28 / 60

28. Which class of proteins is primarily involved in catalyzing biochemical reactions?

a) Structural proteins

b) Enzymatic proteins

c) Transport proteins

d) Defensive proteins

29 / 60

29. What are proteins primarily composed of?

a) Nucleotides

b) Monosaccharides

c) Amino acids

d) Fatty acids

30 / 60

30. Which type of bond links amino acids together in a protein?

a) Hydrogen bond

b) Ionic bond

c) Peptide bond

d) Disulfide bond

31 / 60

31. What is the primary structure of a protein?

a) The linear sequence of amino acids in a polypeptide chain

b) The three-dimensional shape of a protein

c) The folding pattern of a protein

d) The interaction between multiple protein subunits

32 / 60

32. What determines the specific function of a protein?

a) Its size

b) Its shape and structure

c) Its concentration

d) Its color

33 / 60

33. What level of protein structure involves multiple polypeptide chains?

a) Primary structure

b) Secondary structure

c) Tertiary structure

d) Quaternary structure

34 / 60

34. Which of the following can denature a protein?

a) Lowering the temperature

b) Increasing the temperature

c) Adding more substrates

d) Reducing the pH to neutral

35 / 60

35. Which of the following best describes the primary focus of biochemistry?

a) The study of chemical processes and substances that occur within living organisms

b) The study of the physical structure of the earth

c) The study of celestial bodies and the universe

d) The study of animal behavior and ecosystems

36 / 60

36. What is the simplest form of carbohydrates?

a) Polysaccharides

b) Disaccharides

c) Monosaccharides

d) Oligosaccharides

37 / 60

37. Which of the following is a common monosaccharide?

a) Sucrose

b) Lactose

c) Glucose

d) Cellulose

38 / 60

38. Which of the following is a disaccharide?

a) Fructose

b) Starch

c) Maltose

d) Glycogen

39 / 60

39. What type of bond links monosaccharides together to form disaccharides and polysaccharides?

a) Hydrogen bond

b) Glycosidic bond

c) Peptide bond

d) Ionic bond

40 / 60

40. Which polysaccharide is used for energy storage in animals?

a) Cellulose

b) Starch

c) Glycogen

d) Chitin

41 / 60

41. Which of the following polysaccharides is a major component of plant cell walls?

a) Glycogen

b) Cellulose

c) Starch

d) Amylose

42 / 60

42. Which carbohydrate cannot be digested by humans and acts as dietary fiber?

a) Starch

b) Glycogen

c) Cellulose

d) Sucrose

43 / 60

43. What is the primary function of carbohydrates in the human body?

a) To provide structural support

b) To catalyze biochemical reactions

c) To store genetic information

d) To provide energy

44 / 60

44. What is the common name for the carbohydrate sucrose?

a) Table sugar

b) Milk sugar

c) Fruit sugar

d) Blood sugar

45 / 60

45. Which process breaks down carbohydrates into simpler sugars during digestion?

a) Glycolysis

b) Hydrolysis

c) Dehydration synthesis

d) Photosynthesis

46 / 60

46. High intake of which type of carbohydrate is linked to increased risk of dental cavities?

a) Cellulose

b) Lactose

c) Sucrose

d) Fructose

47 / 60

47. Excessive consumption of which carbohydrate is linked to obesity and metabolic syndrome?

a) Fructose

b) Cellulose

c) Lactose

d) Galactose

48 / 60

48. Which carbohydrate is commonly associated with providing quick energy to the body?

a) Cellulose

b) Glucose

c) Starch

d) Glycogen

49 / 60

49. Lactose can be broken down into :

a) 2 molecules of glucose

b) Glucose and Fructose

c) Glucose and Galactose

d) None of these

50 / 60

50. Among nutritional biomolecules which of the following has larger percentage in human body?

a) Carbohydrate

b) Lipid

c) Protein

d) All of these

51 / 60

51. Simple lipids are divided into:

a) Oil and fats

b) waxes and oils

c) waxes and fats

d) Oils , fats and waxes

52 / 60

52. On the basis of Chemical composition Lipids are divided into :

a) Simple Lipids , Complex lipids , Compound Lipids

b) Simple Lipids , Complex lipids , Steroids

c) Simple Lipids , Compounds Lips , Steroids

d) Simple Lipids and Complex Lipids

53 / 60

53. Which of the following are triglycerides or triesters?

a) oils

b) fats

c) waxes

d) a and b

54 / 60

54. Fatty acids chains in fats and oils consists of :

a) C₁₂ to C₂₆

b) C ₁₂ to C₁₈

c) C₁₂ to C ₂₄

d) C₁₄ to C₁₆

55 / 60

55. Which of the following are saturated fatty acids ?

a) Stearic Acid and Palmitic acid

b) Stearic acid and Oleic acid

c) Palmitic acid and Linoleic acid

d) Oleic acid and Linoleic acid

56 / 60

56. Cholestrol is an example of :

a) Simple lipid

b) Complex lipid

c) Steroids

d) Compound Lipid

57 / 60

57. Lipids float on water because:

a) High density

b) Low density

c) No any known reason

d) Lipids don’t float on water

58 / 60

58. Lipids are important because :

a) They store chemical energy twice as compared to Carbohydrates

b) They Help in body insulation

c) They help in absorption of B and C Vitamins

d) A and B

59 / 60

59. Lipids can Exist as:

a) solid

b) Semisolid

c) Liquid

d) All of these

60 / 60

60. Which of the following is correct about melting points of Saturated and Unsaturated Lipids:

a) Melting point of Saturated Lipids> Melting point of Unsaturated Lipids

b) Melting point of Saturated Lipids< Melting point of Unsaturated Lipids

c) Melting point of Saturated Lipids=Melting point of Unsaturated Lipids

d) Can’t decide

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