Multiple Choice
In mature mammalian red blood cells (erythrocytes), which organelle is absent to maximize space for hemoglobin and improve oxygen transport?
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1. Overview of Cell Biology
Eukaryotic Cell Architecture
Multiple Choice
In eukaryotic cell architecture, what is the primary function of the cell wall in organisms such as plants and fungi?
A
It serves as the main site of ATP production through oxidative phosphorylation.
B
It selectively regulates the passage of ions and small molecules into and out of the cell.
C
It packages and sorts proteins for secretion via vesicular transport.
D
It provides structural support and protection, helping maintain cell shape and resist osmotic swelling.
Verified step by step guidance1
Identify the cell structures mentioned in the problem: the cell wall, mitochondria (site of ATP production), plasma membrane (regulates passage of molecules), and Golgi apparatus (packages and sorts proteins).
Recall the primary function of the cell wall in eukaryotic organisms like plants and fungi, which is distinct from the functions of mitochondria, plasma membrane, and Golgi apparatus.
Understand that the cell wall is a rigid layer outside the plasma membrane, composed mainly of polysaccharides such as cellulose in plants and chitin in fungi.
Recognize that the cell wall's main role is to provide structural support and protection, maintaining the cell's shape and preventing excessive water uptake that could cause osmotic swelling.
Conclude that the correct function of the cell wall is to provide structural support and protection, not ATP production, selective permeability, or protein packaging.
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