Plant cell as the functional unit of plants: The basic structural and functional unit of plants, responsible for all physiological processes. Like all living organisms, plants rely on their cells to sustain life functions, growth, and development.
Protoplast: The cell without its cell wall, consisting of the plasma membrane and the enclosed cytoplasm and organelles. It represents the living part of the cell capable of metabolic activity (source content).
Protoplasm: The living substance within the protoplast, composed of cytoplasm and organelles. It is essential for cellular functions such as metabolism, growth, and reproduction (source content).
Presence of various organelles including plasma membrane: Plant cells contain multiple organelles (e.g., nucleus, chloroplasts, mitochondria) enclosed within the plasma membrane, which regulates the exchange of substances and signals between the cell and its environment (source content).
1. How does the plant cell wall differ from the protoplast in structure and function?
2. What best describes the primary composition of the cell membrane?
3. When was the fluid mosaic model of membrane structure proposed?
Plant cell — basic unit?
Structural and functional unit of plants.
Protoplast — definition?
Cell without its cell wall, includes plasma membrane and cytoplasm.
Protoplasm — composition?
Living substance within the protoplast, includes cytoplasm and organelles.
Plant cell wall — main component?
Carbohydrate network mainly of cellulose, hemicellulose, pectins.
Cellulose — role?
Provides tensile strength in the cell wall.
Membrane model — proposed by?
Singer and Nicolson's fluid mosaic model.
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