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 11f
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.
Verified step by step guidance1
Understand the role of the cytoskeleton: The cytoskeleton is composed of three main types of protein filaments—microfilaments (actin filaments), intermediate filaments, and microtubules. Each type has distinct functions in the cell.
Analyze the processes mentioned in the statement: Endocytosis, exocytosis, muscle cell contraction, and cellular 'crawling' are dynamic processes that involve changes in cell shape and movement.
Recall the specific roles of intermediate filaments: Intermediate filaments primarily provide structural support and mechanical strength to the cell. They are not involved in dynamic processes like endocytosis, exocytosis, or cellular movement.
Identify the cytoskeletal components responsible for the processes: Microfilaments (actin filaments) are involved in endocytosis, exocytosis, muscle cell contraction, and cellular 'crawling' due to their role in cell shape and motility. Microtubules also play a role in vesicle transport during endocytosis and exocytosis.
Correct the false statement: The original statement is false. The corrected statement is: 'Endocytosis, exocytosis, muscle cell contraction, and cellular 'crawling' are all mediated by microfilaments, not intermediate filaments.'
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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 various cellular processes, including intracellular transport, cell division, and maintaining cell integrity. The three main components of the cytoskeleton are microfilaments, intermediate filaments, and microtubules, each serving distinct functions.
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Introduction to the Cytoskeleton
Intermediate Filaments
Intermediate filaments are one of the three main components of the cytoskeleton, primarily providing mechanical support and stability to cells. They are composed of various proteins, such as keratins and vimentin, and are crucial for maintaining cell shape and resisting tension. Unlike microtubules and microfilaments, intermediate filaments do not play a direct role in cell motility or transport.
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6:26Sliding Filament Theory
Cell Motility Processes
Cell motility processes, such as endocytosis, exocytosis, muscle contraction, and cellular crawling, involve the movement of cells or materials within cells. These processes are primarily mediated by microfilaments and microtubules rather than intermediate filaments. Understanding the specific roles of these cytoskeletal components is essential for accurately assessing the functions and mechanisms of cellular movement.
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Related Practice
Textbook Question
Explain how and why chromatin is condensed in the nucleus.
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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.
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.
Microtubules are hollow tubes that align organelles and shuttle them to their proper places in the cell.
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Textbook Question
Which of the following statements correctly describes the function of the nucleolus?
a. Within the nucleolus we find genes for rRNA.
b. Nucleoli manufacture mitochondrial proteins for export to the cytosol.
c. Nucleoli assemble the nuclear envelope.
d. The nucleolus contains the genes that form the Golgi apparatus.
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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.
Intermediate filaments are ropelike structures composed of tubulin proteins.
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