Multiple Choice
You isolate a cell with the following characteristics: (1) no nucleus, (2) a cell wall, and the cell is (3) 2 μm in size. This cell could be a/an:
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5. Cell Components
Prokaryotic & Eukaryotic Cells
Multiple Choice
A substance moving from outside the cell into the cytoplasm must pass through __________.
A
a microtubule
B
the endomembrane system
C
a ribosome
D
the nucleus
E
the plasma membrane
Verified step by step guidance1
Understand the structure of a cell: Cells are surrounded by a plasma membrane, which acts as a barrier and regulates the movement of substances in and out of the cell.
Identify the function of the plasma membrane: The plasma membrane is selectively permeable, meaning it allows certain substances to pass through while blocking others.
Consider the options given: A microtubule, the endomembrane system, a ribosome, and the nucleus are all components within the cell, but they do not serve as the boundary between the cell and its external environment.
Recognize the role of the plasma membrane: Since the plasma membrane is the outermost layer of the cell, any substance moving from outside the cell into the cytoplasm must pass through this membrane.
Conclude that the plasma membrane is the correct answer: Based on the understanding of cell structure and function, the plasma membrane is the barrier that substances must cross to enter the cytoplasm.
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