Question 1

?How does the structure of the cell membrane contribute to its functions

Accepted Answer

The cell membrane is composed of a phospholipid bilayer embedded with proteins and other molecules. This structure provides flexibility and fluidity, allowing the membrane to regulate the passage of substances in and out of the cell. Additionally, membrane proteins serve various functions, such as transport, cell signaling, and cell adhesion, contributing to the membrane's selective permeability and its ability to maintain cellular homeostasis.

Question 2

?What are the different mechanisms by which substances cross the cell membrane

Accepted Answer

Substances can cross the cell membrane through various mechanisms, including passive diffusion, facilitated diffusion, active transport, endocytosis, and exocytosis. Passive diffusion involves the movement of molecules down their concentration gradient, while facilitated diffusion requires the assistance of transport proteins. Active transport utilizes energy to move molecules against their concentration gradient, while endocytosis and exocytosis involve the engulfment and release of materials by the cell membrane, respectively. Each mechanism plays a crucial role in regulating the internal environment of the cell.

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Cell Membrane Functions

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DNA Forces maintaining structure

DNA replication

Endocytosis

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Cell Cycle Mitosis

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Cell fates Division Senescence and Death

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Thigh

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Axilla