1. Which biomolecule is the primary source of energy for living organisms?
a. Proteins
b. Carbohydrates
c. Lipids
d. Nucleic acids
Answer: b. Carbohydrates
2. What is the monomer unit of proteins?
a. Nucleotide
b. Amino acid
c. Monosaccharide
d. Fatty acid
Answer: b. Amino acid
3. Which biomolecule is composed of nucleotides and carries genetic information?
a. Proteins
b. Carbohydrates
c. Lipids
d. Nucleic acids
Answer: d. Nucleic acids
4. What is the main function of enzymes in living organisms?
a. Energy storage
b. Structural support
c. Catalyzing biochemical reactions
d. Genetic information storage
Answer: c. Catalyzing biochemical reactions
5. Which of the following is a disaccharide composed of glucose and fructose units?
a. Maltose
b. Lactose
c. Sucrose
d. Cellobiose
Answer: c. Sucrose
6. Which lipid functions as a long-term energy storage molecule in adipose tissue?
a. Phospholipid
b. Steroid
c. Triglyceride
d. Wax
Answer: c. Triglyceride
7. What is the primary structure of a protein?
a. Sequence of amino acids
b. Three-dimensional folding pattern
c. Arrangement of multiple polypeptide chains
d. Interaction with other proteins
Answer: a. Sequence of amino acids
8. Which nucleotide base is not present in RNA?
a. Adenine
b. Thymine
c. Uracil
d. Cytosine
Answer: b. Thymine
9. Which carbohydrate is found in the cell walls of plants and provides structural support?
a. Starch
b. Glycogen
c. Cellulose
d. Chitin
Answer: c. Cellulose
10. What is the function of ATP (adenosine triphosphate) in cells?
a. Long-term energy storage
b. Cell membrane structure
c. Short-term energy currency
d. Genetic information storage
Answer: c. Short-term energy currency
11. Which of the following is a complex carbohydrate that serves as an energy storage molecule in animals?
a. Starch
b. Glycogen
c. Cellulose
d. Fructose
Answer: b. Glycogen
12. What is the primary function of RNA (ribonucleic acid) in cells?
a. Storage of genetic information
b. Catalyzing biochemical reactions
c. Transporting amino acids during protein synthesis
d. Structural support in the cell membrane
Answer: c. Transporting amino acids during protein synthesis
13. Which type of bond is formed between amino acids in a polypeptide chain?
a. Hydrogen bond
b. Peptide bond
c. Ionic bond
d. Covalent bond
Answer: b. Peptide bond
14. Which biomolecule category includes insulin, hemoglobin, and antibodies?
a. Proteins
b. Carbohydrates
c. Lipids
d. Nucleic acids
Answer: a. Proteins
15. Which nucleic acid is involved in the synthesis of proteins in the process of translation?
a. DNA
b. RNA
c. mRNA
d. tRNA
Answer: c. mRNA
16. What is the primary function of cholesterol in animal cell membranes?
a. Energy storage
b. Structural support
c. Regulation of membrane fluidity
d. Enzyme catalysis
Answer: c. Regulation of membrane fluidity
17. Which disaccharide is commonly found in milk and composed of glucose and galactose units?
a. Maltose
b. Lactose
c. Sucrose
d. Fructose
Answer: b. Lactose
18. What is the monomer unit of nucleic acids?
a. Amino acid
b. Nucleotide
c. Monosaccharide
d. Fatty acid
Answer: b. Nucleotide
19. Which lipid plays a crucial role in the insulation and protection of nerve fibers?
a. Phospholipid
b. Steroid
c. Triglyceride
d. Wax
Answer: b. Steroid
20. Which enzyme is responsible for breaking down starch into maltose during digestion?
a. Amylase
b. Lipase
c. Protease
d. Ribonuclease
Answer: a. Amylase
21. Where is the protein named – alpha keratin found in the body?
a. Blood
b. Skin
c. Intestine
d. Lymph
Answer – b, skin
22. What is a non-reducing carbohydrate?
a. Glucose
b. Maltose
c. Sucrose
d. Fructose
Answer – c, sucrose
23. Which of the following is the non-proteinaceous enzyme
a. Deoxyribonuclease
b. Ligase
c. Ribozyme
d. Lysozyme
Answer – c, Ribozyme
24. Biomolecules are characterized by
a. Alanine amino acid – a fatty acid with an amino group and an acidic group throughout the molecule
b. Palmitic acid – a polyunsaturated fatty acid with 18 carbon atoms
c. Lecithin – a phosphorylated glyceride found in the cell membrane
d. Adenylic acid – adenosine combined with glucose phosphate
Answer – c, Lecithin – a phosphorylated glyceride found in the cell membrane
25. Inulin is characterized by…………
a. Lipid
b. Protein
c. Polysaccharide
d. Vitamin
Answer- c, Polysaccharide
26. Which enzyme catalyzes the hydrolysis of glucose?
a. Glucosidase
b. Trypsin
c. Peptin
d. Alcalase
Answer- a, Glucosidase
27. It is possible to classify enzymes, vitamins, and hormones as a single category of biological chemicals because they all
a. Enhance oxidative metabolism
b. Are conjugated proteins
c. Are exclusively synthesized in the body of a living organism
d. Help in regulating metabolism
Answer – d, help in regulating metabolism
28. Which is the most abundant protein in the human body?
a. Collagen
b. Myosin
c. Actin
d. Albumin
Answer – a, Collagen
29. What is the most critical property of an enzyme?
a. Composition
b. Thermal denaturation
c. Specificity
d. Solubility
Answer – c, Specificity
30. The final product of starch digestion is
a. Maltose
b. Fructose
c. Glucose
d. Sucrose
Answer – c, Glucose
31. Cellulose is
a. Monosaccharide of glucose
b. Disaccharide of Glucose
c. Polysaccharide of glucose
d. Monomers of Glucose
Answer – c, Polysaccharide of Glucose
32. Which enzyme catalyzes the oxidation of hemoglobin?
a. Oxidase
b. Catalase
c. Amylase
d. Coenzyme
Answer – a, Oxidase
33. Which of the following is NOT a function of lipids in living organisms?
a. Long-term energy storage
b. Insulation and cushioning
c. The structural component of cell membranes
d. Enzymatic catalysis
Answer- d, Enzymatic catalysis
34. If the DNA percentage of thymine is 20 then what will be a percentage of guanine?
a. 20%
b. 30%
c. 40%
d. 60%
Answer – a, 20%
35. Proteins normally do not contain which element?
a. C
b. N
c. S
d. P
Answer – d, P
36. Which of the following is an amino acid which is not considered aromatic?
a. Valine
b. Tyrosine
c. Phenylalanine
d. Tryptophan
Answer – a, Valine