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Question

Difficulty: EasyCell Structure and Function

Which cellular structure acts as a selectively permeable barrier, regulating the movement of substances into and out of the cell?

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

Answer

Cell membrane
The cell membrane (plasma membrane) is the phospholipid bilayer enclosing the cell that selectively regulates the influx and efflux of ions, nutrients, and waste products to maintain homeostasis.

Step-by-Step Solution

1
Identify the primary biological function described in the question.
The target function is maintaining a selectively permeable barrier and controlling molecular transport into and out of the cell.
Recognizing the functional definition of major cellular components is necessary to select the correct organelle.
2
Match the identified function with the correct cellular structure.
The cell membrane (plasma membrane) consists of a phospholipid bilayer that regulates internal cellular homeostasis by controlling transport.
All living cells possess a cell membrane to regulate internal conditions relative to the external environment.

Key Concept

Selective permeability of the cell membrane
Estimated Time:35s
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Topics

Cell Structure and Function

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