30 Questions
Which of the following is a function of microvilli on the apical surface of epithelial cells?
Increase surface area for absorption
What is the main component of microvilli?
Actin filaments
Where are microvilli commonly found in the body?
All of the above
Which proteins cross-link actin filaments in the core of a microvillus?
Fimbrin and villin
What is the function of cilia in our body?
All of the above
What is the internal structure of cilia called?
Axoneme
What is the mechanism of ciliary movement?
Sliding microtubule mechanism
Which of the following is true about ciliary movement?
Ciliary bending is caused by sliding of outer doublet microtubules
What is the role of dynein in ciliary and flagellar motility?
Dynein is essential for the movement of cilia and flagella
How does dynein produce microtubule sliding?
By undergoing cyclic break and reattachment
What is the main characteristic of Kartagener's syndrome?
Situs inversus totalis
Which of the following is NOT a component of a basal body?
Single microtubules
What is the function of basal bodies in cilia and flagella?
To anchor the cilia and flagella to the cell membrane
What is the function of stereocilia?
To increase cell surface area for absorption
Which statement about flagella is correct?
Flagella have a different internal structure than cilia
Which proteins are responsible for cross-linking actin filaments in the core of a microvillus?
Fimbrin and villin
What is the function of cilia in our body?
To move mucus over respiratory epithelial surfaces
What is the arrangement of microtubules in a cilium or flagellum called?
Axoneme
What is the mechanism of ciliary movement?
Sliding microtubule mechanism
Which of the following accurately describes the structure of basal bodies in cilia and flagella?
Basal bodies are cylindrical structures composed of nine sets of triplet microtubules.
What is the main difference between cilia and flagella?
Cilia are shorter and have a whip-like movement, while flagella are longer and have a wave-like movement.
What is the function of rootlets in basal bodies?
Rootlets extend from the basal body into the apical cytoplasm and play a role in the organization of axoneme microtubules.
What is the role of dynein in ciliary and flagellar motility?
Dynein arms generate the force for microtubule sliding in cilia and flagella.
What is the function of microvilli on the apical surface of epithelial cells?
To increase the surface area for absorption
What is the main component of microvilli?
Actin filaments
Which surface of epithelial cells is modified with microvilli?
Apical surface
Which of the following is the correct mechanism of ciliary and flagellar beating?
Ciliary and flagellar beating is produced by the sliding of outer doublet microtubules relative to one another
What is the main function of dynein in ciliary and flagellar motility?
Dynein forms temporary cross bridges between microtubules
What is the characteristic feature of Kartagener's syndrome?
Situs inversus totalis
What is the cause of immotility in Kartagener's syndrome?
Absence of dynein arms in ciliary axonemes
Test your knowledge of the Sliding Microtubule Mechanism in cilia beating with this quiz. Learn about the different phases and cross sections near the tips of cilia, and understand the observations and results related to microtubule shortening.
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