Life: The Science of Biology
11th Edition
ISBN: 9781319010164
Author: David E. Sadava, David M. Hillis, H. Craig Heller, Sally D. Hacker
Publisher: W. H. Freeman
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Chapter 6.2, Problem 2R
Summary Introduction
To review:
The three types of cell junctions those are most similar to plasmodesmata.
Introduction:
The plasmodesmata are the specialized junction, through which the plant cells that help in the direct cytoplasmic exchange between the cells. They are basically microscopic channels, which aid in traversing the cell walls of the plant cells. This helps in communication and transportation between the two cells.
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https://en.wikipedia.org/wiki/Cell_junction#:~:text=Cell%20junctions%20(or%20intercellular%20bridges,the%20extracellular%20matrix%20in%20animals.
Most adjacent plant cells are connected by plasmodesmata, whereas only certain adjacent animal cells are connected through gap junctions. What might account for this difference?
Chapter 6 Solutions
Life: The Science of Biology
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- 12) Match the cell-cell junction on the left with the appropriate function on the right. Note that more than one letter may apply for a particular function and that each letter may be used more than once or not at all. A) Gap junctions provides a very strong attachment point between cells B) Desmosomes allow easy movement of large amounts of substances between adjacent cells C) Plasmodesmata seals the plasma membranes of adjacent cells together, preventing the movement of molecules between them D) Tight junctionsarrow_forwardWhich two types of cell junctions would you expect to find between muscle cells of the heart?arrow_forwardWhat is the justification for considering gap junctions and plasmodesmata to be functionally similar? How do they differ structurally?arrow_forward
- Can you compare the structures and functions of tight junctions, anchoring junctions, and gap junctions?arrow_forwardWhich of the following statements related to intercellular junctions is false? Cadherins are important cell-cell adhesion proteins. A cadherin-mediated junction involves many cadherin molecules to achieve strong adhesion. The cytoplasmic domain of cadherins interacts with actin or intermediate filament cytoskeleton through adaptor proteins. Because tight junctions seal the membrane of adjacent epithelial cells, transmembrane proteins in the apical portion of the plasma membrane cannot move to the basal lateral domain or vice versa. Proteins can diffuse through an open gap junction.arrow_forwardAre gap junctions located in all cells? If not, which cells do not contain gap junctions?arrow_forward
- List and describe the three main types of cytoskeleton. If you wanted to do immunocytochemistry to specifically stain each type of cytoskeleton, what is a protein that could be used for each cytoskeletal type (in other words, what is a unique protein for each cytoskeletal type)? What are three types of actin structures? Describe the involvement of actin structures in cell migration. How is the growth and shrinking of microtubules regulated? Then describe the roles of microtubules in: chromosomal separation during mitosis and the movement of organelles and vesicles within a cell. Describe a possible mechanism on how signaling pathways might impact the cytoskeleton, so that cell migration could be regulated in a localized manner within a multicellular organism. (hint: think about the possible transcriptional regulation of the G-protein regulators) What are 2 main challenges of protein targeting? Then describe one way these challenges are overcome during signal-based targeting and one way…arrow_forwardGap junctions between cells allow direct contact of the cytoplasm between neighboring cells. What kind of cells might you find these in and how do they facilitate the function of these cells?arrow_forwardHow are plasmodesmata and gap junctions similar? How are they dissimilar? Would you expect a moderately sized protein to pass through a plasmodesmaarrow_forward
- Which of the following is a feature common to all three components of the cytoskeleton?arrow_forwardJoins the intermediate filaments in one cell to those of a neighboring cell a) Adheren Junctions b)Hemidesmosomes c)Tight Junctions d)Desmosomes e)Gap Junctionsarrow_forwardName the parts of a cell in which the following organelles exist: (a) centrioles, (b) microtubules, (c) nuclear envelope, (d) chromatin. What are their functions?arrow_forward
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