Multiple Choice
What is the primary difference between smooth and rough endoplasmic reticulum in eukaryotic cells?
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2. Cell Chemistry & Cell Components
Introduction to Eukaryotic Organelles
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Which of the following molecules is required by cells to assemble cilia or flagella?
A
Keratin
B
Tubulin
C
Actin
D
Collagen
Verified step by step guidance1
Understand the structure and function of cilia and flagella: Cilia and flagella are hair-like structures that extend from the surface of many eukaryotic cells. They are involved in movement and sensory functions.
Identify the main structural component of cilia and flagella: Both cilia and flagella are primarily composed of microtubules, which are cylindrical structures made of protein subunits.
Recognize the protein subunit that forms microtubules: Microtubules are made up of tubulin proteins. Tubulin is a globular protein that polymerizes to form the hollow tubes of microtubules.
Differentiate between the given options: Keratin, actin, and collagen are proteins with different functions. Keratin is a structural protein in hair and nails, actin is involved in muscle contraction and cell movement, and collagen provides structural support in connective tissues.
Conclude that tubulin is the molecule required for the assembly of cilia and flagella, as it is the building block of microtubules, which are essential for their structure and function.
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