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Question

Difficulty: EasyCell Structure and Function

Which cellular component forms a selectively permeable boundary that regulates the passage of materials into and out of the cell?

  1. A
    Cell wall
  2. Cell membraneAnswer
  3. C
    Chloroplast
  4. D
    Mitochondrion

Answer

The cell membrane
The cell membrane (also called the plasma membrane) consists of a phospholipid bilayer with embedded proteins. It encloses the cell contents and is selectively permeable, allowing essential nutrients to enter while keeping harmful substances out and expelling waste.

Step-by-Step Solution

1
Identify the primary cellular structure that acts as a selectively permeable barrier.
The plasma membrane (cell membrane) is composed of a phospholipid bilayer that regulates transport into and out of the cytoplasm.
Every living cell requires a flexible, selective barrier to maintain homeostasis by controlling nutrient uptake and waste removal.

Key Concept

Cell membrane structure and selective permeability
Estimated Time:35s
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Topics

Cell Structure and Function

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