Biology 2e
2nd Edition
ISBN: 9781947172517
Author: Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher: OpenStax
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Textbook Question
Chapter 4, Problem 23RQ
The key components of desmosomes are cadherins and.
- actin
- microfilaments
- intermediate filaments
- microtubules
Expert Solution & Answer
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Integrins are important in cell crawling because
they anchor the leading edge of the cell to the surface it is moving over
they are receptors for diffusible chemical ligands that determine the direction the cell will move in
they cross-link actin filaments to microtubules and intermediate filaments of the cytoskeleton
they serve as nucleating sites for polymerization of new actin filaments
Actin filaments and microtubules are similar with respect to each of the following EXCEPT:
inherent polarity with plus and minus ends
growth requires an organizing center
association with motor proteins
both are polymers of subunits
regular remodeling
Which of the following are characteristics of both actin filaments and microtubules?
Select all that apply
They have structural polarity
Their filaments undergo treadmilling
Capping proteins affect length and stability of the filament
The monomers bind ATP and spontaneously form polymers
Chapter 4 Solutions
Biology 2e
Ch. 4 - Figure 4.7 Prokaryotic cells are much smaller than...Ch. 4 - Figure 4.8 If the nucleolus were not able to carry...Ch. 4 - Figure 4.18 If a peripheral membrane protein were...Ch. 4 - When viewing a specimen through a light...Ch. 4 - The is the basic unit of life organism cell tissue...Ch. 4 - Prokaryotes depend on to obtain some materials and...Ch. 4 - Bacteria that lack fimbriae are less likely to...Ch. 4 - Which of the following organisms is a prokaryote?...Ch. 4 - Which of the following is surrounded by two...Ch. 4 - Peroxisomes got their name because hydrogen...
Ch. 4 - In plant cells, the function of the lysosomes is...Ch. 4 - Which of the following is both in eukaryotic and...Ch. 4 - Tay-Sachs disease is a genetic disorder that...Ch. 4 - Which of the following is not a component of the...Ch. 4 - The process by which a cell engulfs a foreign...Ch. 4 - Which of the following is most likely to have the...Ch. 4 - Which of the following sequences correctly lists...Ch. 4 - Congenital disorders of glycosylation are a...Ch. 4 - Which of the following have the ability to...Ch. 4 - Which of the following do not play a role in...Ch. 4 - In humans, are used to move a cell within its...Ch. 4 - Which of the following are only in plant cells?...Ch. 4 - The key components of desmosomes are cadherins...Ch. 4 - Diseased animal cells may produce molecules that...Ch. 4 - In your everyday life, you have probably noticed...Ch. 4 - In what situation(s) would the use of a scanning...Ch. 4 - In what situation(s) would a transmission electron...Ch. 4 - What are the advantages and disadvantages of each...Ch. 4 - Explain how the formation of an adult human...Ch. 4 - Antibiotics are medicines that are used to fight...Ch. 4 - Explain why not all microbes are harmful.Ch. 4 - You already know that ribosomes are abundant in...Ch. 4 - What are the structural and functional...Ch. 4 - Why are plasma membranes arranged as a bilayer...Ch. 4 - In the context of cell biology, what do we mean by...Ch. 4 - In your opinion, is the nuclear membrane part of...Ch. 4 - What are the similarities and differences between...Ch. 4 - How do cilia and flagella differ?Ch. 4 - Describe how microfilaments and microtubules are...Ch. 4 - Compare and contrast the boundaries that plant,...Ch. 4 - How does the structure of a plasmodesma differ...Ch. 4 - Explain how the extracellular matrix functions.Ch. 4 - Pathogenic E. coil have recently been shown to...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- Put the following in order of size from smallest to largest microtubules sarcomere intermediate filaments microfilaments dynienarrow_forwardWhich of the following cell junctions are involved with anchoring of the cell to the extracellular matrix? Select all that apply Desmosomes Gap Junctions Hemidesmosomes Adherens junctionsarrow_forwardWhich of the following can be used to describe both desmosomes and adherens junctions? Select all that apply. They provide strong attachments through linkage with actin cytoskeleton O They provide strong attachments through linkage with intermediate filaments Both of them function to hold adjacent cells firmly together O Types of cadherin proteins are used to mediate cell-cell adhesionarrow_forward
- Which of the following is NOT a way intermediate filaments are unique compared to the other cytoskeletal filaments? intermediate filaments rely on accessory proteins for their function intermediate filaments can be found inside the nucleus intermediate filaments are made from fibrous protein subunits intermediate filaments do not have structural polarity O intermediate filaments do not interact with motor proteinsarrow_forwardWhich of the following statements regarding cytoskeletal filaments is FALSE? Microtubules will rapidly disassemble in response to a drop in the ATP concentration. G-actin monomers and alpha-tubulin/beta-tubulin dimers assemble into filaments in their ATP-bound and GTP-bound forms, respectively. Microtubules are stabilized by microtubule-binding proteins, such as Tau. Actin-binding proteins allow F-actin to assemble in cells in many different ways. Hydrolysis of ATP and GTP changes the conformation of the subunits once they are incorporated into actin filaments and microtubules, respectively.arrow_forwardSecretory vesicles containing insulin move to the plasma membrane at the cell surface and release the protein to neighboring blood capillaries. Which Cytoskeletal element is essential for this vesicle movement within a cell? Lamins Intermediate filaments Microtubules Microfilamentsarrow_forward
- There are types of cytoskeleton fiber- intermediate filaments. Tell their structure and/or function.arrow_forwardActin filaments are anchored at tight junctions desmosomes gap junction focal adhesion complexesarrow_forwardWhich of the following statements applies to all three major classes of cytoskeletal polymers (microtubules, actin filaments and intermediate filaments)? They have intrinsic polarity They assemble from protein subunits synthesized on free polyribosomes They add subunits only at their ends They are involved in cell motility Their constituent proteins are tissue specificarrow_forward
- Please explain how an intermediate filament is similar and different in a normal skin cell while in a dry skin cell, dividing cell and normal skin tissuearrow_forwardWhich of the cytoskeletal structures depicted provide resistance against mechanical stress (think about the disease that causes blistering of the skin with the slightest touch)?arrow_forwardIn the fluid mosaic model: plasma membrane proteins orient their hydrophilic sides toward the internal bilayer. phospholipids often flip-flop between the inner and outer layers. the mosaic refers to proteins attached to the underlying cytoskeleton. the fluid refers to the phospholipid bilayer. the mosaic refers to the symmetry of the internal membrane proteins and sterols.arrow_forward
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