Plasma membranes are said to be
(a) Impermeable
(b) Freely permeable
(c) Selectively permeable
(d) Actively permeable
(e) Slightly permeable

검증된 단계별 안내

Understand the concept of permeability in the context of plasma membranes. Permeability refers to the ability of substances to pass through the membrane.

Recall that plasma membranes control the movement of substances in and out of the cell, allowing some molecules to pass while restricting others.

Recognize that 'impermeable' means no substances can pass through, which is not true for plasma membranes since they allow selective passage.

Note that 'freely permeable' means all substances can pass without restriction, which is also incorrect for plasma membranes.

Conclude that plasma membranes are best described as 'selectively permeable' because they regulate the entry and exit of specific molecules based on size, charge, and solubility.

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주요 개념

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Plasma Membrane Structure

The plasma membrane is a biological barrier composed mainly of a phospholipid bilayer with embedded proteins. This structure provides fluidity and flexibility, allowing it to control the movement of substances in and out of the cell.

Selective Permeability

Selective permeability refers to the plasma membrane's ability to allow certain molecules or ions to pass through while blocking others. This property is essential for maintaining cellular homeostasis by regulating nutrient intake and waste removal.

Transport Mechanisms Across Membranes

Transport across the plasma membrane occurs via passive methods like diffusion and osmosis, or active methods requiring energy. These mechanisms enable the cell to control internal conditions by selectively moving substances based on size, charge, and concentration.

Plasma membranes are said to be(a) Impermeable(b) Freely permeable(c) Selectively permeable(d) Actively permeable(e) Slightly permeable