Which transport mechanisms require a membrane; which ones require a plasma membrane and which ones can also occur through artificial membranes; which ones require ATP; and which mechanisms cease if ATP is unavailable, as upon death. Introduction: Cells are regarded as the simplest unit (structural and functional) of life. Cellular membrane, nucleus, and cytoplasm are the three major components of a cell. Cellular membrane, which surrounds the entire cell, is composed of phospholipids and proteins. By defining the cell’s boundary, plasma membrane controls the intake of substances into the cell and release of substances out of the cell. This selectively permeable membrane is a phospholipid bilayer with proteins inserted in it. It acts as both wall and gateway between the extracellular fluid and the cytoplasm. It permits the passage of some substances (wastes and nutrients), while hindering the passage of other substances (phosphates and proteins).

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Chapter 3.3, Problem 15AYLO

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Which transport mechanisms require a membrane; which ones require a plasma membrane and which ones can also occur through artificial membranes; which ones require ATP; and which mechanisms cease if ATP is unavailable, as upon death.

Introduction:

Cells are regarded as the simplest unit (structural and functional) of life. Cellular membrane, nucleus, and cytoplasm are the three major components of a cell. Cellular membrane, which surrounds the entire cell, is composed of phospholipids and proteins. By defining the cell’s boundary, plasma membrane controls the intake of substances into the cell and release of substances out of the cell. This selectively permeable membrane is a phospholipid bilayer with proteins inserted in it. It acts as both wall and gateway between the extracellular fluid and the cytoplasm. It permits the passage of some substances (wastes and nutrients), while hindering the passage of other substances (phosphates and proteins).

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