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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2. Cell Chemistry & 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. It is composed of a phospholipid bilayer with embedded proteins that facilitate transport.
Consider the options given: Evaluate each option to determine which structure a substance must pass through to enter the cytoplasm from outside the cell.
Analyze why the plasma membrane is the correct answer: The plasma membrane is the first structure a substance encounters when moving from the extracellular environment into the cytoplasm. Other structures like microtubules, the endomembrane system, ribosomes, and the nucleus are located inside the cell and do not serve as barriers to entry.
Conclude that the plasma membrane is essential for maintaining homeostasis by controlling the entry and exit of substances, thus playing a crucial role in cellular function.
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