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SCIENTIFIC INQUIRY Although both ends of a microtubule can gain or lose subunits, one end (called the plus end)
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- Which of the following properties are shared by desmosomes and hemidesmosomes? Select all that apply. They both are protein structures found in eukaryotic cells They both bind extracellular matrix proteins They both bind to intermediate filaments They both bind to acti filamentsarrow_forwardActin 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 remodelingarrow_forwardThe effect of MAP2 on microtubules is similar to the effect of CapZ on microfilaments how? both stabilize the positive end of the filament both bundle the filaments in parallel bundles both increase the instability of the negative end of the filament both nucleate the formation of the filamentsarrow_forward
- Match each term with its best description. ___ cell plate a. lump of cells ___ spindle b. made of microfilaments ___ tumor c. divide plant cells ___ cleavage furrow d. spindle originates here ___ contractile ring e. dangerous metastatic cells ___ cancer f. made of microtubules ___ centrosomes g. indentation ___ telomere h. shortens with agearrow_forwardScientists often extract DNA from the nucleus of cells for analysis or use. This process breaks the cell membrane, spins the solution to remove the large particles through high g-force, adds alcohol to make the DNA less soluble aqueous solution, then spins the solution again to pull the DNA out of solution. Consider a cell in metaphase compared to a cell in rest (not in the cell cycle leading to cell division). What properties of a metaphase cell might let you extract more DNA compared to the resting cell? Are there any that might make the extraction more difficult?arrow_forwardThe subunits of which filament bind to GTP, a condition that favors the polymerization of the cytoskeletal subunits? O Intermediate filaments Microfilaments O Microtubulesarrow_forward
- Put the following in order of size from smallest to largest microtubules sarcomere intermediate filaments microfilaments dynienarrow_forwardIntegrins 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 filamentsarrow_forwardMatch each of the following to its role in the cell. Microtubules Actin Tubulin Intermediate filaments Kinesin Dynein Myosin Centrosome A. Cytoskeletal fiber that is intermediate in diameter and very sturdy. Does not form from polymerization of protein monomers like the other ones we discussed in class, but consists of polypeptide strands. Keratin and Lamin A are examples. B. The structure that initiates polymerization of new microtubules and anchors microtubules in the center of the cell near the Golgi Complex. C. Motor protein whose activity results in contraction of muscle. D. Thinnest cytoskeletal filament. Responsible for initiation of amoeboid cell movement via pseudopod formation. E. The "monomer" unit of the thickest cytoskeletal polymer; a dimer of two polypeptide subunits. F. Cytoskeletal structure with the…arrow_forward
- can microtubule replace actin filament?why or why not?arrow_forwardMicrotubules within a cell appear to be arranged in specific arrays. What cellular structure is responsible for determining the arrangement of microtubules within a cell? How many of these structures are found in a typical cell? Describe how such structures serve to nucleate microtubule assembly.arrow_forward+ 1. What are the components of the cytoskeleton in an animal cell? Fill in the table below to explain: Type of Cytoskeletal Structure Subunits and Shape Size (smallest, intermediate, largest) Function(s) Associated Motor Proteins Microtubules Intermediate Filaments n/a Microfilaments 0arrow_forward