BIOCHEM-ACHIEVE(FIRST DAY DISCOUNTED)
9th Edition
ISBN: 2818000069358
Author: BERG
Publisher: MAC HIGHER
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Question
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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What keeps the actin monomers from polymerizing totally into filaments? explain.
Please help me with this question. More than one answer may be correct.
Intermediate filaments
Options:
A)
are larger than 10nm in diameter
B)
have a hollow core
C)
include microtubules
D)
uses a filamentous monomers
E)
have multiple types of monomers they can be composed of.
Actin filaments have a defined polarity. What is filament polarity? How is it generated at the subunit level?
Chapter 36 Solutions
BIOCHEM-ACHIEVE(FIRST DAY DISCOUNTED)
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biochemistry and related others by exploring similar questions and additional content below.Similar questions
- Salmoneus dies.When a cell dies its plasma membrane becomes“leaky”;i.e.,it becomes permeable to ions that were unable to freely cross the membrane during life. Thus, after death, calcium ions leak across the sarcolemma of muscle fibers. This calcium leak causes rigor mortis, a temporary stiffness of the muscles after death. Apply your understanding of the mechanism of skeletal muscle contraction (specifically regarding events within muscle fibre) and explain the molecular basis of the phenomenon known as rigor mortis.arrow_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_forwardWhat would be the consequences of actin filament assembly/disassembly if a mutation prevented actins ability to bing ATParrow_forward
- True or False. Both cytosolic intermediate filaments and microtubules display dynamic instability. Select one: a. False b. Truearrow_forwardAll of the following are filamentous proteins EXCEPTarrow_forwardThe role of GTP hydrolysis in actin polymerization is similar to the role of ATP hydrolysis in tubulin polymerization: both serve to weaken the bonds in the polymer and thereby promote depolymerization. Is that true or false? why?arrow_forward
- So you have a solid substance. So you start to add heat to it. What happens as you start to do this? Increasing the rate of heating of a substance at its melting point only causes more rapid melting. When the melting point is reached, ther thermal energy is sufficient to overcome intermolecular forces holding the components at their statioinary points. Thermal energy causes the components of the solid to vibrate faster. Heating of the now formed liquid results in increaseing the liquid temperture.arrow_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_forwardWhat triggers the movement of the thin filament? Is it because of the high --> low energy configuration? The exact mechanism is confusing to me.arrow_forward
- True or false. Gap junctions enable substances to move between cells via ATP driven hydrolysis.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_forwardWhich 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_forward
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