BIOCHEMISTRY (LOOSELEAF)-W/ACCESS
9th Edition
ISBN: 9781319425784
Author: BERG
Publisher: Macmillan Higher Education
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Chapter 36, Problem 7P
Interpretation Introduction
Interpretation:
Actin monomers in ATP form
Concept introduction:
The actin is a type of microfilaments of the cytoskeletal system. The actin monomers polymerize by addition of the actin at the end and form long helical chains.
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"The role of ATP hydrolysis in actin polymerization is similar to the role of GTP hydrolysis in tubulin polymerization: both serve to weaken the bonds in the polymer and thereby promote depolymerization", is true or false.
Chapter 36 Solutions
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- What would be the consequences of actin filament assembly/disassembly if a mutation prevented actins ability to bing ATParrow_forwardAddition 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 Zarrow_forwardNeurofilament proteins assemble into long, intermediate filaments , found in abundance running along the length of nerve cell axons. The C-terminal region of these proteins is an unstructured polypeptide, hundreds of amino acids long and heavily modified by the addition of phosphate groups. The term “polymer brush” has been applied to this part of the neurofilament. can you suggest why?arrow_forward
- True or false. Gap junctions enable substances to move between cells via ATP driven hydrolysis.arrow_forwardnetwork of collagen fibers. Which type of glycoprotein is found in cartilage? Cartilage consists of glycoproteins (protein/carbohydrate molecules) enmeshed in a peptidoglycan glycogen proteoglycan N-acetylglucosamine chains lipopolysaccharide b) e) The carbon and energy sources emploved by organisms in their major metabolic pathways can be used to classify the organisms. With this metabolic classification, which of the following is characteristic of chemoheterotrophs? includes green plants and photosynthetic bacteria; use CO2 as a carbon source and light as an energy source use organic compounds both as carbon source and energy source class of specialized bacteria that use CO2 as a carbon source and organic compounds as an energy source use CO2 as sole source of carbon to synthesize other compounds organic compounds used as carbon source and light as energy source; includes specialized bacteria a) b) c) d) e)arrow_forwardSelect 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.arrow_forward
- 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 filamentarrow_forwardWhich statements are true? Explain why or why not.1 The role of ATP hydrolysis in actin polymerizationis similar to the role of GTP hydrolysis in tubulin polym-erization: both serve to weaken the bonds in the polymerand thereby promote depolymerization.2 Motor neurons trigger action potentials in musclecell membranes that open voltage-sensitive Ca2+ channelsin T tubules, allowing extracellular Ca2+ to enter the cyto-sol, bind to troponin C, and initiate rapid muscle contrac-tion.3 In most animal cells, minus-end directed microtu-bule motors deliver their cargo to the periphery of the cell,whereas plus-end directed microtubule motors delivertheir cargo to the interior of the cell.arrow_forwardActin 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 addedarrow_forward
- I'm waiting.... thank youarrow_forwardMuscle cells require a lot of energy to operate normally. Thus, muscle cells likely contain a high number of: [Select the best answer. ] mitochondria lysosomes vacuoles nuclei transport vesicles smooth endoplasmic reticulum rough endoplasmic reticulum golgi complexes ribosomesarrow_forwardHC CH reaction with HC CH lysosome CH CH HC CH3 HC CH3 HC CH HC. CH CH3 CH3 ОН OH inside the cell, propranolol sometimes encounters lysosomes, which alter its NH group as shown above (right). reacting with the lysosomes, propranolol becomes trapped inside the cell and can cause psoriasis or other inflammatory side effects. Use IMFS to explain why the altered propranolol gets trapped. Tarrow_forward
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