BIOS 255 Week 3 Quiz Exam 4 (Latest
Update ) Anatomy and
Physiology IV with Lab | Questions &
Answers | 100% Correct | Grade A -
Chamberlain
1. Which organelle is known as the powerhouse of the cell?
A. Nucleus
B. Mitochondria
C. Chloroplast
D. Ribosome
Correct Answer: B
Rationale: Mitochondria generate ATP through cellular respiration.
2. Which organelle is responsible for photosynthesis?
A. Nucleus
B. Mitochondria
C. Chloroplast
D. Ribosome
Correct Answer: C
Rationale: Chloroplasts capture light energy to synthesize glucose.
3. Which organelle stores water and nutrients in plant cells?
,A. Vacuole
B. Lysosome
C. Golgi apparatus
D. Ribosome
Correct Answer: A
Rationale: Vacuoles maintain turgor pressure and store materials.
4. Which organelle modifies and packages proteins?
A. Endoplasmic reticulum
B. Golgi apparatus
C. Lysosome
D. Ribosome
Correct Answer: B
Rationale: Golgi apparatus processes proteins for secretion or
internal use.
5. Which organelle contains digestive enzymes?
A. Lysosome
B. Ribosome
C. Golgi apparatus
D. Smooth ER
Correct Answer: A
Rationale: Lysosomes degrade macromolecules and cellular waste.
6. Which organelle synthesizes proteins for secretion?
,A. Rough ER
B. Smooth ER
C. Golgi apparatus
D. Lysosome
Correct Answer: A
Rationale: Rough ER is studded with ribosomes for protein
synthesis.
7. Which organelle synthesizes lipids and detoxifies chemicals?
A. Rough ER
B. Smooth ER
C. Golgi apparatus
D. Lysosome
Correct Answer: B
Rationale: Smooth ER produces lipids and metabolizes toxins.
8. Which cytoskeletal protein forms microtubules?
A. Actin
B. Tubulin
C. Keratin
D. Myosin
Correct Answer: B
Rationale: Tubulin polymerizes into microtubules for transport and
mitosis.
9. Which cytoskeletal protein forms microfilaments?
, A. Actin
B. Tubulin
C. Keratin
D. Myosin
Correct Answer: A
Rationale: Actin filaments maintain cell shape and motility.
10. Which cytoskeletal protein resists mechanical stress?
A. Actin
B. Tubulin
C. Intermediate filaments
D. Myosin
Correct Answer: C
Rationale: Intermediate filaments stabilize cells under stress.
11. Which enzyme unwinds the DNA double helix during
replication?
A. DNA polymerase
B. Helicase
C. Ligase
D. Primase
Correct Answer: B
Rationale: Helicase separates DNA strands at the replication fork.
12. Which enzyme synthesizes RNA primers?
Update ) Anatomy and
Physiology IV with Lab | Questions &
Answers | 100% Correct | Grade A -
Chamberlain
1. Which organelle is known as the powerhouse of the cell?
A. Nucleus
B. Mitochondria
C. Chloroplast
D. Ribosome
Correct Answer: B
Rationale: Mitochondria generate ATP through cellular respiration.
2. Which organelle is responsible for photosynthesis?
A. Nucleus
B. Mitochondria
C. Chloroplast
D. Ribosome
Correct Answer: C
Rationale: Chloroplasts capture light energy to synthesize glucose.
3. Which organelle stores water and nutrients in plant cells?
,A. Vacuole
B. Lysosome
C. Golgi apparatus
D. Ribosome
Correct Answer: A
Rationale: Vacuoles maintain turgor pressure and store materials.
4. Which organelle modifies and packages proteins?
A. Endoplasmic reticulum
B. Golgi apparatus
C. Lysosome
D. Ribosome
Correct Answer: B
Rationale: Golgi apparatus processes proteins for secretion or
internal use.
5. Which organelle contains digestive enzymes?
A. Lysosome
B. Ribosome
C. Golgi apparatus
D. Smooth ER
Correct Answer: A
Rationale: Lysosomes degrade macromolecules and cellular waste.
6. Which organelle synthesizes proteins for secretion?
,A. Rough ER
B. Smooth ER
C. Golgi apparatus
D. Lysosome
Correct Answer: A
Rationale: Rough ER is studded with ribosomes for protein
synthesis.
7. Which organelle synthesizes lipids and detoxifies chemicals?
A. Rough ER
B. Smooth ER
C. Golgi apparatus
D. Lysosome
Correct Answer: B
Rationale: Smooth ER produces lipids and metabolizes toxins.
8. Which cytoskeletal protein forms microtubules?
A. Actin
B. Tubulin
C. Keratin
D. Myosin
Correct Answer: B
Rationale: Tubulin polymerizes into microtubules for transport and
mitosis.
9. Which cytoskeletal protein forms microfilaments?
, A. Actin
B. Tubulin
C. Keratin
D. Myosin
Correct Answer: A
Rationale: Actin filaments maintain cell shape and motility.
10. Which cytoskeletal protein resists mechanical stress?
A. Actin
B. Tubulin
C. Intermediate filaments
D. Myosin
Correct Answer: C
Rationale: Intermediate filaments stabilize cells under stress.
11. Which enzyme unwinds the DNA double helix during
replication?
A. DNA polymerase
B. Helicase
C. Ligase
D. Primase
Correct Answer: B
Rationale: Helicase separates DNA strands at the replication fork.
12. Which enzyme synthesizes RNA primers?
