- A) Complex I
- B) Complex II
- C) Complex III
- D) Complex IV
Biochemistry MCQ
Total MCQ: 92
82 Which complex in the ETC is also known as NADH-CoQ reductase?
- A) Complex I
- B) Complex II
- C) Complex III
- D) Complex IV
83 What is the basic unit of proteins?
- A) Nucleotide
- B) Amino acid
- C) Monosaccharide
- D) Fatty acid
84 Which molecule is known as the energy currency of the cell?
- A) DNA
- B) ATP
- C) RNA
- D) Glucose
85 What type of bond holds the two strands of DNA together?
- A) Ionic bond
- B) Covalent bond
- C) Hydrogen bond
- D) Peptide bond
86 Which enzyme is responsible for DNA replication?
- A) DNA polymerase
- B) RNA polymerase
- C) Ligase
- D) Helicase
87 What is the role of ribosomes in the cell?
- A) DNA replication
- B) Protein synthesis
- C) Lipid synthesis
- D) Carbohydrate breakdown
88 What is the primary function of enzymes in biochemical reactions?
- A) To act as a substrate
- B) To increase activation energy
- C) To speed up reactions
- D) To act as a product
89 What is the main function of carbohydrates in the body?
- A) Energy storage
- B) DNA synthesis
- C) Oxygen transport
- D) Hormone production
90 Which of the following is a coenzyme?
- A) Vitamin C
- B) Hemoglobin
- C) ATP
- D) DNA