📌 Biology multiple-choice questions (MCQs) on biochemical molecules along with their answers
1. Which of the following is a major class of biomolecules that are essential for energy storage and cell structure?
_A) Nucleic acids
_B) Carbohydrates
_C) Proteins
_D) Lipids
Answer: B) Carbohydrates
2. What type of bond holds the two strands of DNA together?
_A) Hydrogen bond
_B) Ionic bond
_C) Covalent bond
_D) Peptide bond
Answer: A) Hydrogen bond
3. Which of the following is a monosaccharide?
_A) Sucrose
_B) Glucose
_C) Lactose
_D) Starch
Answer: B) Glucose
4. Which of the following is the main structural component of the cell membrane?
_A) Carbohydrates
_B) Proteins
_C) Lipids
_D) Nucleic acids
Answer: C) Lipids
5. What is the basic building block of proteins?
_A) Nucleotide
_B) Fatty acid
_C) Amino acid
_D) Monosaccharide
Answer: C) Amino acid
6. Which of the following enzymes is responsible for breaking down starch into simpler sugars?
_A) Amylase
_B) Lipase
_C) Protease
_D) Ligase
Answer: A) Amylase
7. Which molecule is the primary energy carrier in cells?
_A) ATP
_B) NADH
_C) Glucose
_D) RNA
Answer: A) ATP
8. Which of the following is true about the structure of nucleic acids?
_A) Nucleic acids consist of a sugar, phosphate group, and a nitrogenous base.
_B) Nucleic acids are composed of amino acids.
_C) Nucleic acids do not contain phosphate groups.
_D) Nucleic acids are made only of sugars.
Answer: A) Nucleic acids consist of a sugar, phosphate group, and a nitrogenous base.
9. Which type of lipid is most commonly found in cell membranes?
_A) Triglycerides
_B) Phospholipids
_C) Steroids
_D) Waxes
Answer: B) Phospholipids
10. Which of the following best describes the structure of a triglyceride?
_A) A sugar molecule linked to a phosphate group
_B) A single amino acid linked to a protein
_C) Three fatty acids linked to a glycerol backbone
_D) A nitrogenous base linked to a sugar
Answer: C) Three fatty acids linked to a glycerol backbone
Choose the correctly punctuated sentence:
A. However I don’t agree with your idea.
B. However, I don’t agree with your idea.
C. However I, don’t agree with your idea.
D. However I don’t, agree with your idea.
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1. Which of the following is a major class of biomolecules that are essential for energy storage and cell structure?
_A) Nucleic acids
_B) Carbohydrates
_C) Proteins
_D) Lipids
Answer: B) Carbohydrates
2. What type of bond holds the two strands of DNA together?
_A) Hydrogen bond
_B) Ionic bond
_C) Covalent bond
_D) Peptide bond
Answer: A) Hydrogen bond
3. Which of the following is a monosaccharide?
_A) Sucrose
_B) Glucose
_C) Lactose
_D) Starch
Answer: B) Glucose
4. Which of the following is the main structural component of the cell membrane?
_A) Carbohydrates
_B) Proteins
_C) Lipids
_D) Nucleic acids
Answer: C) Lipids
5. What is the basic building block of proteins?
_A) Nucleotide
_B) Fatty acid
_C) Amino acid
_D) Monosaccharide
Answer: C) Amino acid
6. Which of the following enzymes is responsible for breaking down starch into simpler sugars?
_A) Amylase
_B) Lipase
_C) Protease
_D) Ligase
Answer: A) Amylase
7. Which molecule is the primary energy carrier in cells?
_A) ATP
_B) NADH
_C) Glucose
_D) RNA
Answer: A) ATP
8. Which of the following is true about the structure of nucleic acids?
_A) Nucleic acids consist of a sugar, phosphate group, and a nitrogenous base.
_B) Nucleic acids are composed of amino acids.
_C) Nucleic acids do not contain phosphate groups.
_D) Nucleic acids are made only of sugars.
Answer: A) Nucleic acids consist of a sugar, phosphate group, and a nitrogenous base.
9. Which type of lipid is most commonly found in cell membranes?
_A) Triglycerides
_B) Phospholipids
_C) Steroids
_D) Waxes
Answer: B) Phospholipids
10. Which of the following best describes the structure of a triglyceride?
_A) A sugar molecule linked to a phosphate group
_B) A single amino acid linked to a protein
_C) Three fatty acids linked to a glycerol backbone
_D) A nitrogenous base linked to a sugar
Answer: C) Three fatty acids linked to a glycerol backbone
Choose the correctly punctuated sentence:
A. However I don’t agree with your idea.
B. However, I don’t agree with your idea.
C. However I, don’t agree with your idea.
D. However I don’t, agree with your idea.
@Ethioquizzes
@Ethiomatrichub
@Ethiomatrics