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Chapter 4: Problem 38

What are the similarities and differences between the structures of centrioles and flagella? a. Centrioles and flagella are made of microtubules but show different arrangements. b. Centrioles are made of microtubules but flagella are made of microfilaments and both show the same arrangement. c. Centrioles and flagella are made of microfilaments. Centrioles have a 9 + 2 arrangement. d. Centrioles are made of microtubules and flagella are made of microfilaments and both have different structures

Short Answer

Expert verified
The correct option is a.

Step by step solution

01

Understanding the Structure of Centrioles

Centrioles are cylindrical structures composed of microtubules. They have a specific structure known as the '9 + 0' arrangement, which consists of nine triplets of microtubules arranged in a circular pattern without a central pair.
02

Understanding the Structure of Flagella

Flagella are whip-like structures that enable cell movement. They are also composed of microtubules and have a '9 + 2' arrangement, meaning nine pairs of microtubules surround a central pair of microtubules.
03

Analyzing the Arrangements and Components

Comparing the structures, both centrioles and flagella are made of microtubules but exhibit different microtubule arrangements ('9 + 0' for centrioles and '9 + 2' for flagella).
04

Identifying Incorrect Statements

Option b wrongly states that flagella are made of microfilaments, and suggests they have the same arrangement as centrioles, which they do not. Option c incorrectly states that centrioles and flagella are made of microfilaments and mislabels the arrangement of centrioles. Option d also inaccurately claims that flagella are made of microfilaments.
05

Choosing the Correct Option

Based on the analysis, option a correctly states that both centrioles and flagella are made of microtubules but have different arrangements.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Centrioles
Centrioles are small, cylindrical structures found in animal cells. Each centriole is composed of microtubules, which are tube-like structural proteins. These microtubules are arranged in a specific pattern known as '9 + 0'鈥攏ine triplets of microtubules arranged in a ring without a central pair.

Centrioles play a key role in cell division. They help organize microtubules during mitosis to form the spindle apparatus, which separates chromosomes into daughter cells.
Centrioles are also involved in forming cilia and flagella but do so by being part of a structure called the basal body, which serves as the foundation for the growth of these structures.
Flagella
Flagella are long, whip-like structures that protrude from the surface of certain cells, including many bacteria, protozoa, and sperm cells. These structures are essential for cell movement. Unlike centrioles, flagella have a '9 + 2' arrangement of microtubules鈥攏ine pairs of microtubules form a ring around two central microtubules.

The coordinated movement of these microtubules allows the flagellum to whip back and forth, propelling the cell through its environment.
In addition to movement, flagella can also be sensory organelles, helping cells detect changes in their surroundings.
Microtubules
Microtubules are one of the main components of the cell's cytoskeleton. They are made of tubulin proteins and provide structural support to the cell. These tube-like structures are crucial for many cellular processes such as maintaining cell shape, facilitating intracellular transport, and separating chromosomes during cell division.

Microtubules form the main structural elements in both centrioles and flagella but in different arrangements. In centrioles, they follow a '9 + 0' pattern, while in flagella, they have a '9 + 2' pattern.
Microtubules are dynamic, meaning they can rapidly grow or shrink, allowing them to adapt quickly to the cell's needs.
Cell Movement
Cell movement is a fundamental biological process, essential for the survival and function of various cell types. Structures like flagella, cilia, and certain motor proteins contribute to this movement.

Flagella enable cells to swim through liquid environments by creating undulating movements. In contrast, cilia are shorter and more numerous, often working together to move fluid or particles along the cell surface.
Apart from flagella and cilia, other types of cell movement include amoeboid movement, which relies on the cell's cytoskeleton's flexibility, and the use of motor proteins like kinesin and dynein, which transport cellular components along microtubules.

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Most popular questions from this chapter

Bacteria do not have organelles; yet, the same reactions that take place on the mitochondria inner membrane, the phosphorylation of ADP to ATP, and chloroplasts, photosynthesis, take place in bacteria. Where do these reactions take place? a. These reactions take place in the nucleoid of the bacteria. b. These reactions occur in the cytoplasm present in the bacteria. c. These reactions occur on the plasma membrane of bacteria. d. These reactions take place in the mesosomes

Radioactive amino acids are fed to a cell in culture for a short amount of time. This is called a pulse. You follow the appearance of radioactive proteins in the cell compartments. In which organelles and in what order does radioactivity appear? a. endoplasmic reticulum - lysosomes - Golgi body - vesicle - extracellular region b. endoplasmic reticulum - vesicles - Golgi body - vesicles - extracellular region c. Golgi Body - vesicles - endoplasmic reticulum - vesicles - extracellular region d. nucleus - endoplasmic reticulum - Golgi body - vesicle - extracellular region

Which of the following is most likely to have the greatest concentration of smooth endoplasmic reticulum (SER)? a. a cell that secretes enzymes b. a cell that destroys pathogens c. a cell that makes steroid hormones d. a cell that engages in photosynthesis

What are the structural and functional similarities and differences between mitochondria and chloroplasts? a. Similarities: double membrane, inter-membrane space, ATP production, contain DNA. Differences: mitochondria have inner folds called cristae, chloroplast contains accessory pigments in thylakoids, which form grana and a stroma. b. Similarities: DNA, inter-membrane space, ATP production, and chlorophyll. Differences: mitochondria have a matrix and inner folds called cristae; chloroplast contains accessory pigments in thylakoids, which form grana and a stroma. c. Similarities: double membrane and ATP production. Differences: mitochondria have inter-membrane space and inner folds called cristae; chloroplast contains accessory pigments in thylakoids, which form grana and a stroma. d. Similarities: double membrane and ATP production. Differences: mitochondria have inter-membrane space, inner folds called cristae, ATP synthase for ATP synthesis, and DNA; chloroplast contains accessory pigments in thylakoids, which, form grana and a stroma

How do cilia and flagella differ? a. Cilia are made of microfilaments and flagella of microtubules. b. Cilia are helpful in the process of engulfing food. Flagella are involved in the movement of the organism. c. Cilia are short and found in large numbers on the cell surface whereas flagella are long and fewer in number. d. Cilia are found in prokaryotic cells and flagella in eukaryotic cells.
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