BIOS 255 Week 4 Quiz Exam 3 (Latest
Update ) Anatomy and
Physiology IV with Lab | Questions &
Answers | 100% Correct | Grade A -
Chamberlain
1. What is the primary function of enzymes in cells?
A. Store energy
B. Speed up chemical reactions
C. Transport molecules
D. Encode genetic information
Correct Answer: B
Rationale: Enzymes act as catalysts to accelerate biochemical
reactions without being consumed.
2. Which macromolecule is the main source of energy for cells?
A. Proteins
B. Lipids
C. Carbohydrates
D. Nucleic acids
Correct Answer: C
Rationale: Carbohydrates are the primary energy source, especially
glucose.
,3. Which organelle is responsible for protein synthesis?
A. Mitochondria
B. Ribosome
C. Golgi apparatus
D. Lysosome
Correct Answer: B
Rationale: Ribosomes translate mRNA into polypeptides.
4. Which organelle is responsible for energy production?
A. Chloroplast
B. Mitochondria
C. Nucleus
D. Ribosome
Correct Answer: B
Rationale: Mitochondria generate ATP through cellular respiration.
5. Which organelle is responsible for photosynthesis in plant
cells?
A. Chloroplast
B. Mitochondria
C. Nucleus
D. Ribosome
Correct Answer: A
Rationale: Chloroplasts convert sunlight into chemical energy.
,6. Which biomolecule forms the main structure of cell
membranes?
A. Carbohydrates
B. Proteins
C. Lipids
D. Nucleic acids
Correct Answer: C
Rationale: Phospholipids form the bilayer structure of membranes.
7. Which type of bond holds water molecules together?
A. Covalent
B. Ionic
C. Hydrogen
D. Peptide
Correct Answer: C
Rationale: Hydrogen bonds give water its cohesion and high surface
tension.
8. Which type of bond joins amino acids in a protein?
A. Hydrogen
B. Peptide
C. Ionic
D. Covalent
Correct Answer: B
Rationale: Peptide bonds link amino acids in a polypeptide chain.
, 9. Which biomolecule stores genetic information?
A. Carbohydrates
B. Proteins
C. Lipids
D. Nucleic acids
Correct Answer: D
Rationale: DNA and RNA carry genetic instructions.
10. Which nitrogenous base is found in RNA but not in DNA?
A. Adenine
B. Thymine
C. Uracil
D. Cytosine
Correct Answer: C
Rationale: RNA uses uracil instead of thymine.
11. Which sugar is present in DNA?
A. Ribose
B. Deoxyribose
C. Glucose
D. Fructose
Correct Answer: B
Rationale: DNA contains deoxyribose sugar.
12. Which sugar is present in RNA?
Update ) Anatomy and
Physiology IV with Lab | Questions &
Answers | 100% Correct | Grade A -
Chamberlain
1. What is the primary function of enzymes in cells?
A. Store energy
B. Speed up chemical reactions
C. Transport molecules
D. Encode genetic information
Correct Answer: B
Rationale: Enzymes act as catalysts to accelerate biochemical
reactions without being consumed.
2. Which macromolecule is the main source of energy for cells?
A. Proteins
B. Lipids
C. Carbohydrates
D. Nucleic acids
Correct Answer: C
Rationale: Carbohydrates are the primary energy source, especially
glucose.
,3. Which organelle is responsible for protein synthesis?
A. Mitochondria
B. Ribosome
C. Golgi apparatus
D. Lysosome
Correct Answer: B
Rationale: Ribosomes translate mRNA into polypeptides.
4. Which organelle is responsible for energy production?
A. Chloroplast
B. Mitochondria
C. Nucleus
D. Ribosome
Correct Answer: B
Rationale: Mitochondria generate ATP through cellular respiration.
5. Which organelle is responsible for photosynthesis in plant
cells?
A. Chloroplast
B. Mitochondria
C. Nucleus
D. Ribosome
Correct Answer: A
Rationale: Chloroplasts convert sunlight into chemical energy.
,6. Which biomolecule forms the main structure of cell
membranes?
A. Carbohydrates
B. Proteins
C. Lipids
D. Nucleic acids
Correct Answer: C
Rationale: Phospholipids form the bilayer structure of membranes.
7. Which type of bond holds water molecules together?
A. Covalent
B. Ionic
C. Hydrogen
D. Peptide
Correct Answer: C
Rationale: Hydrogen bonds give water its cohesion and high surface
tension.
8. Which type of bond joins amino acids in a protein?
A. Hydrogen
B. Peptide
C. Ionic
D. Covalent
Correct Answer: B
Rationale: Peptide bonds link amino acids in a polypeptide chain.
, 9. Which biomolecule stores genetic information?
A. Carbohydrates
B. Proteins
C. Lipids
D. Nucleic acids
Correct Answer: D
Rationale: DNA and RNA carry genetic instructions.
10. Which nitrogenous base is found in RNA but not in DNA?
A. Adenine
B. Thymine
C. Uracil
D. Cytosine
Correct Answer: C
Rationale: RNA uses uracil instead of thymine.
11. Which sugar is present in DNA?
A. Ribose
B. Deoxyribose
C. Glucose
D. Fructose
Correct Answer: B
Rationale: DNA contains deoxyribose sugar.
12. Which sugar is present in RNA?
