Biomolecules Multiple Choice Questions and Answers

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1. Which of the following is a phospholipid?
  1. Sterol
  2. Cholesterol
  3. Lecithin
  4. Steroid

Answer: Lecithin

2. Which of the following groups is a type of aromatic amino acids?
  1. Glycine, Tyrosine, Arginine
  2. Phenylalanine, Tyrosine, Tryptophan
  3. Arginine, Histidine, Isoleucine
  4. More than one of the above

Answer: Phenylalanine, Tyrosine, Tryptophan

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3. Which of the following is an amino acid which is not considered aromatic?
  1. Valine
  2. Tyrosine
  3. Phenylalanine
  4. Tryptophan

Answer: Valine

4. Enzymes, antibodies, and hormones are examples of:
  1. Carbohydrates
  2. Proteins
  3. Lipids
  4. Nucleic acids

Answer: Proteins

5. The genetic material of cells is composed of:
  1. Proteins
  2. Carbohydrates
  3. Lipids
  4. Nucleic acids

Answer: Nucleic acids

6. Which biomolecule stores genetic information and directs cellular activities?
  1. Carbohydrates
  2. Proteins
  3. Lipids
  4. Nucleic acids

Answer: Nucleic acids

7. Identify the basic amino acid from the following.
  1. Lysine
  2. Valine
  3. Tyrosine
  4. More than one of the above

Answer: Lysine

8. The cells having well - organized nucleus with a nuclear membrane are designated as_______.
  1. Cheek cells
  2. autokaryotic cells
  3. eukaryotic cells
  4. prokaryotic cells

Answer: eukaryotic cells

9. Biomolecules are characterized by
  1. Alanine amino acid – a fatty acid with an amino group and an acidic group throughout the molecule
  2. Palmitic acid – a polyunsaturated fatty acid with 18 carbon atoms
  3. Lecithin – a phosphorylated glyceride found in the cell membrane
  4. Adenylic acid – adenosine combined with glucose phosphate

Answer: Lecithin – a phosphorylated glyceride found in the cell membrane

10. It is possible to classify enzymes, vitamins, and hormones as a single category of biological chemicals because they all
  1. Enhance oxidative metabolism
  2. Are conjugated proteins
  3. Are exclusively synthesized in the body of a living organism
  4. Help in regulating metabolism

Answer: help in regulating metabolism

11. What is the most critical property of an enzyme?
  1. Composition
  2. Thermal denaturation
  3. Specificity
  4. Solubility

Answer: Specificity

12. Which enzyme catalyzes the oxidation of hemoglobin?
  1. Oxidase
  2. Catalase
  3. Amylase
  4. Coenzyme

Answer: Oxidase

13. If the DNA percentage of thymine is 20 then what will be a percentage of guanine?
  1. 20%
  2. 30%
  3. 40%
  4. 60%

Answer: 20%

14. Which biomolecule is the primary source of energy in living organisms?
  1. Proteins
  2. Carbohydrates
  3. Nucleic acids
  4. Lipids

Answer: Carbohydrates

15. The building blocks of proteins are:
  1. Nucleotides
  2. Amino acids
  3. Monosaccharides
  4. Fatty acids

Answer: Amino acids

16. The monomer units of nucleic acids are:
  1. Amino acids
  2. Nucleotides
  3. Monosaccharides
  4. Fatty acids

Answer: Nucleotides

17. Which of the following is a polysaccharide used for energy storage in plants?
  1. Cellulose
  2. Glycogen
  3. Starch
  4. Chitin

Answer: Starch

18. Koshland’s theory of enzyme action is known as
  1. Lock and key theory
  2. Reduced fit theory
  3. Induced fit theory
  4. Enzyme coenzyme theory

Answer: Induced fit theory

19. Which is the most abundant biomolecule on earth?
  1. Mineral salts
  2. Proteins
  3. Lipids
  4. Carbohydrates

Answer: Carbohydrates

20. The fastest enzyme is
  1. DNA gyrase
  2. Pepsin
  3. DNA polymerase
  4. Carbonic anhydrase

Answer: Carbonic anhydrase

21. Identify the basic amino acid from the following.
  1. Lysine
  2. Valine
  3. Tyrosine
  4. More than one of the above

Answer:Lysine

22. What is a non-reducing carbohydrate?
  1. Glucose
  2. Maltose
  3. Sucrose
  4. Fructose

Answer: Sucrose

23. Which enzyme catalyzes the hydrolysis of glucose?
  1. Glucosidase
  2. Trypsin
  3. Peptin
  4. Alcalase

Answer: Glucosidase

24. Cellulose is
  1. Monosaccharide of glucose
  2. Disaccharide of Glucose
  3. Polysaccharide of glucose
  4. Monomers of Glucose

Answer: Polysaccharide of Glucose

25. Which monosaccharide is known as "blood sugar"?
  1. Glucose
  2. Fructose
  3. Galactose
  4. Sucrose

Answer: Glucose

26. Which of the following is a disaccharide?
  1. Glucose
  2. Fructose
  3. Sucrose
  4. Starch

Answer: Sucrose

27. Which is a reducing sugar?
  1. Galactose
  2. Gluconic acid
  3. Sucrose
  4. β-methyl galactosidase

Answer: Galactose

28. The most common secondary structure of proteins is
  1. β-pleated sheet
  2. β-pleated sheet parallel
  3. β-pleated sheet non-parallel
  4. α-helix

Answer: α-helix

29. Haemoglobin has
  1. Primary structure
  2. Secondary structure
  3. Tertiary structure
  4. Quaternary structure

Answer: Quaternary structure

30. Which of the following are not secondary metabolites in plants?
  1. Rubber, gums
  2. Morphine, codeine
  3. Amino acids, glucose
  4. More than one of the above

Answer: Amino acids, glucose

31. Inulin is characterized by…………
  1. Lipid
  2. Protein
  3. Polysaccharide
  4. Vitamin

Answer: Polysaccharide

32. Which of the following is NOT a function of lipids in living organisms?
  1. Long-term energy storage
  2. Insulation and cushioning
  3. The structural component of cell membranes
  4. Enzymatic catalysis

Answer: Enzymatic catalysis

33. Most abundant RNA in the cell
  1. rRNA
  2. mRNA
  3. tRNA
  4. tRNA threonine

Answer: rRNA

34. Which of the following is not a function of lipids?
  1. Energy storage
  2. Structural component of cell membranes
  3. Enzyme catalyst
  4. Insulation

Answer: Enzyme catalyst

35. Which biomolecule is distributed more widely in a cell?
  1. Chloroplast
  2. RNA
  3. DNA
  4. Spaherosomes

Answer: RNA

36. Name the simplest amino acid
  1. Alanine
  2. Tyrosine
  3. Asparagine
  4. Glycine

Answer: Glycine

37. β-oxidation occurs in
  1. Nucleus
  2. Cytoplasm
  3. Mitochondria
  4. Chloroplast

Answer: Mitochondria

38. Balbiani rings present inside the chromosomes are sites of
  1. RNA formation
  2. DNA replication
  3. Translation
  4. More than one of the above

Answer: RNA formation

39. Which of the following is the non-proteinaceous enzyme
  1. Deoxyribonuclease
  2. Ligase
  3. Ribozyme
  4. Lysozyme

Answer: Ribozyme

40. Which is the most abundant protein in the human body??
  1. Collagen
  2. Myosin
  3. Actin
  4. Albumin

Answer: Collagen

41. Mineral associated with cytochrome is
  1. Mg
  2. Cu and Ag
  3. Fe
  4. Cu

Answer: Fe

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