Difficulty: Easy
Correct Answer: Mitochondria
Explanation:
Introduction / Context:
Distinguishing features of plant and animal cells is a foundational topic. While plants have unique structures such as cell walls, chloroplasts, and a large central vacuole, there are organelles shared by both lineages. Identifying what they have in common helps anchor comparative cell biology and avoids stereotyping organelles as plant- or animal-exclusive when they are not.
Given Data / Assumptions:
Concept / Approach:
Mitochondria are universal among aerobic eukaryotes, conducting the citric acid cycle and oxidative phosphorylation. Plants also possess mitochondria in addition to chloroplasts. Cell walls, chloroplasts, and a prominent central vacuole characterize plant cells; animal cells generally lack these structures. Plasmodesmata are plant-specific intercellular channels.
Step-by-Step Solution:
Verification / Alternative check:
Electron micrographs and biochemical evidence (e.g., mitochondrial DNA, respiratory chains) confirm mitochondria in both plant and animal cells. Plants need mitochondrial respiration particularly in non-photosynthetic tissues and during the night.
Why Other Options Are Wrong:
Common Pitfalls:
Assuming chloroplasts replace mitochondria in plants; both coexist because many biosynthetic and respiratory demands require mitochondrial ATP and metabolic integration.
Final Answer:
Mitochondria
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