Textbook Question
Our somatic cells' DNA is distributed among 46 ________ in the nucleus.
a. Nucleosomes
b. Chromatids
c. Nucleoli
d. Chromosomes
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Ch. 3 The Cell
Amerman3rd EditionHuman Anatomy & PhysiologyISBN: 9780138247201, 9780138247928, 9780138201814
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Table of contents
- Ch. 1 Introduction to Anatomy and Physiology24
- Ch. 2 The Chemistry of Life37
- Ch. 3 The Cell54
- Ch. 4 Histology46
- Ch. 5 The Integumentary System30
- Ch. 6 Bones and Bone Tissue36
- Ch. 7 The Skeletal System40
- Ch. 8 Articulations19
- Ch. 9 The Muscular System35
- Ch. 10 Muscle Tissue and Physiology29
- Ch. 11 Introduction to the Nervous System and Nervous Tissue28
- Ch. 12 The Central Nervous System41
- Ch. 13 The Peripheral Nervous System41
- Ch. 14 The Autonomic Nervous System and Homeostasis31
- Ch. 15 The Special Senses39
- Ch. 16 The Endocrine System42
- Ch. 17 The Cardiovascular System I: The Heart28
- Ch. 18 The Cardiovascular System II: The Blood Vessels43
- Ch. 19 Blood32
- Ch. 20 The Lymphatic System and Immunity41
- Ch. 21 The Respiratory System27
- Ch. 22 The Digestive System27
- Ch. 23 Metabolism and Nutrition7
- Ch. 24 The Urinary System39
- Ch. 25 Fluid, Electrolyte, and Acid-Base Homeostasis39
- Ch. 26 The Reproductive System10
- Ch. 27 Development and Heredity5
Amerman3rd EditionHuman Anatomy & PhysiologyISBN: 9780138247201, 9780138247928, 9780138201814Not the one you use?Change textbook
Chapter 3, Problem 11d
Mark the following statements about the cytoskeleton as true or false. If a statement is false, correct it to make a true statement.
Intermediate filaments are ropelike structures composed of tubulin proteins.
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Understand the structure and function of intermediate filaments: Intermediate filaments are part of the cytoskeleton, which provides structural support to the cell. They are ropelike structures, but they are not composed of tubulin proteins. Instead, they are made of various proteins such as keratin, vimentin, or lamin, depending on the cell type.
Review the role of tubulin proteins: Tubulin proteins are the building blocks of microtubules, another component of the cytoskeleton. Microtubules are hollow, tube-like structures that play a role in intracellular transport, cell division, and maintaining cell shape.
Compare intermediate filaments and microtubules: Intermediate filaments are more flexible and provide tensile strength to the cell, while microtubules are rigid and involved in dynamic processes like mitosis and intracellular transport.
Evaluate the statement: The statement claims that intermediate filaments are composed of tubulin proteins. This is false because tubulin is specific to microtubules, not intermediate filaments.
Correct the false statement: Rewrite the statement to make it true. The corrected statement is: 'Intermediate filaments are ropelike structures composed of various proteins such as keratin, vimentin, or lamin, depending on the cell type.'
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Cytoskeleton
The cytoskeleton is a dynamic network of protein filaments and tubules that provides structural support, shape, and organization to cells. It plays a crucial role in cell movement, division, and intracellular transport. The three main components of the cytoskeleton are microfilaments, intermediate filaments, and microtubules, each with distinct functions and compositions.
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Introduction to the Cytoskeleton
Intermediate Filaments
Intermediate filaments are a type of cytoskeletal component that provide mechanical support to cells and help maintain their shape. Unlike microtubules, which are made of tubulin, intermediate filaments are composed of various proteins, such as keratins, vimentin, and neurofilaments. They are essential for resisting tension and are involved in anchoring organelles within the cell.
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Guided course
6:26Sliding Filament Theory
Microtubules
Microtubules are hollow, tube-like structures made of tubulin protein subunits. They are part of the cytoskeleton and play key roles in maintaining cell shape, enabling intracellular transport, and facilitating cell division through the formation of the mitotic spindle. Microtubules are dynamic, constantly undergoing polymerization and depolymerization, which allows cells to adapt to various functions.
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Related Practice
Textbook Question
Mark the following statements about the cytoskeleton as true or false. If a statement is false, correct it to make a true statement.
Centrioles are part of the centrosome from which microtubules originate.
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Textbook Question
Mark the following statements about the cytoskeleton as true or false. If a statement is false, correct it to make a true statement.
Endocytosis, exocytosis, muscle cell contraction, and cellular 'crawling' are all mediated by intermediate filaments.
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Textbook Question
Mark the following statements about the cytoskeleton as true or false. If a statement is false, correct it to make a true statement.
Microtubules are hollow tubes that align organelles and shuttle them to their proper places in the cell.
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Textbook Question
Mark the following statements about the cytoskeleton as true or false. If a statement is false, correct it to make a true statement.
The cilia found on sperm cells propel the cells through a liquid medium.
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Textbook Question
Mark the following statements about the cytoskeleton as true or false. If a statement is false, correct it to make a true statement.
Actin filaments combine with myosin motor proteins to provide the cell with mechanical strength.
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