?What is the unique feature of the collagen helix compared to the a helix Hydrophobic interactions a O Supramolecular complexes bO Right-handed twisting O Three amino acid residues per turn d Colled coil structure e D
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- Select the correct description explaining the assembly of intermediate filaments. O The process requires ATP binding to an intermediate filament protein - two dimers make a tetramer, then association of 8 tetramers form a filament. The process requires GTP binding to an intermediate filament protein-two dimers make a tetramer, then association of 8 tetramers form a filament. O No ATP/GTP binding to an intermediate filament protein required - two dimers make a tetramer, then association of 8 tetramers form a filament. Formation of a triple-helix, as seen in collagen, would be required for the assembly of intermediate filaments.Which of the following describes an F-actin microfilament? A flexible, helical filament composed of two strands assembled from G-actin 13 protofilaments composed of heterodimers with a hollow core a flexible filament composed of 13 interwoven protofilaments Eight tetramers twisted into a rope-like filamentAddition of which of the following would increase the rate of actin depolymerization on the minus end of the filament by dissociating ADP-actin? Othymosin-b4 O cofilin O ATP-G-actin O profilin O Cap Z
- Microfilaments and intermediate filaments are different in that only microfilaments are dynamic intermediate filaments are dynamic microfilaments are composed of proteins O A. В. bound to a ribonucleotide ´intermediate filaments are important for maintaining the shape of animal cellsWhat is the rate-limiting step in the formation of an actin filament? Addition of actin monomers to an existing filament None of the above Initiation, or nucleation Cross-linkingActin filaments in a test tube: O a. undergo disassembly if the concentration of free ATP-bound actin monomers is very high and latrunculin is added O b. rapidly grow if the concentration of free ATP-bound actin monomers is very high and a latrunculin is added O c. undergo treadmilling if the concentration of free ATP-bound actin monomers is intermediate and phalloidin is added O d. rapidly grow if the concentration of free ATP-bound actin monomers is intermediate and cytochalasin is added
- What could be the reason why hydroxylation of proline residues is critical to the structural integrity of collagen? Select the correct response The hydroxyl moities in Pro form disulfide bonds which stabilize collagen structure. The hydroxyl moities in Pro form ionic bonds (salt bridges) which stabilize collagen structure. The hydroxyl moities in Pro form hydrophobic interactions which stabilize collagen structure. The hydroxyl moities in Pro form peptide bonds which stabilize collagen structure. The hydroxyl moities in Pro form H-bonds which stabilize collagen structure.Snipping Tool New L ADAL Q Q- Q At which of the following sites is the characteristic triple helical structure of the collagen initially formed? A. Extracellular space B. Golgi body C. Nucleus T D. Rough endoplasmic reticulum E. Smooth endoplasmic reticulum 부분 C 21 4 3 12 W Beat zoom 3 C Edit in Paint EP CCleavage of a phosphate bond is needed for de-polymerization of which mature polymer? Neither microfilaments nor intermediate filaments Microfilaments only Both microfilaments and intermediate filaments Intermediate filaments only
- What is a property that is shared by microtubules and actin filaments? Polymer assembly requires that subunits contain a bound ATP Polymer assembly requires that subunits contain a bound GTP The polymer is assembled from subunits that are protein monomers Assembly and disassembly occurs only at one end of the polymer Subunit assembly is followed by nucleotide hydrolysisDetermine whether the following statements apply to microtubules, intermediate filaments, or actin filaments."a. Thinnest cytoskeletal filaments; are associated with the motor protein myosinb. Consist of proteins twisted together into a ropelike formc. Allow certain cells to “crawl” and change the shape and size of the celld. Consist of protein subunits surrounding a hollow coree. Help a cell to resist mechanical stressf. Grow from the cell’s centrosome"A fabric company wants to create a new material based on cell research for the army that is able to bear high levels of tension efficiently. What cellular structure should be the target? Microtubules O Intermediate filaments O Actin filaments O Centriols O Pili
