Nokea
Which structure is responsible for organizing microtubules and assisting in cell division?
- A. Centriole
- B. Nucleus
- C. Ribosome
- D. Peroxisome
Correct Answer: A
Rationale: Centrioles organize the spindle fibers for cell division.
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Skeletal muscle is composed of very hard working cells. Which organelles do you expect to find in abundance in skeletal muscle cell?
- A. nuclei
- B. striations
- C. golgi bodies
- D. mitochondria
Correct Answer: D
Rationale: Mitochondria are abundant in skeletal muscle cells to provide energy (ATP) for their high metabolic demands.
Which cellular structure is responsible for breaking down cellular waste and debris?
- A. Ribosome
- B. Nucleus
- C. Lysosome
- D. Golgi apparatus
Correct Answer: C
Rationale: Lysosomes contain enzymes that degrade waste materials and cellular debris.
Which one of the following statements best describes DNA?
- A. single stranded, deoxyribonucleic acid
- B. single stranded, ribonucleic acid
- C. double stranded, deoxyribonucleic acid
- D. double stranded, ribonucleic acid
Correct Answer: C
Rationale: DNA is double stranded, while the "D" refers to "deoxy-."
Intervertebral discs are composed of:
- A. elastic connective tissue
- B. elastic cartilage
- C. hyaline cartilage
- D. fibrocartilage
Correct Answer: D
Rationale: Intervertebral discs are fibrocartilage, providing strength and flexibility.
Neutrophil granulocytes
- A. Are the most common leukocyte in normal blood.
- B. Contain proteolytic enzymes.
- C. Have a lifespan in the circulation of 3-4 weeks.
- D. Contain actin and myosin microfilaments.
Correct Answer: A
Rationale: Neutrophils are the most abundant WBCs (~60-70%), contain enzymes for phagocytosis, and have a short lifespan (~1-2 days).