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- What would be the consequences of actin filament assembly/disassembly if a mutation prevented actins ability to bing ATPQUESTION 9 Which of the following is/are a motor protein(s) that can carry vesicles along microtubules? A Dynein B Kinesin C Myosin D Tau E A and BQUESTION 2: Select the correct statement regarding the actin cytoskeleton O They are involved in the formation of the axoneme Actin microfilaments are the most stable rytoskeleton network can undergo catastrophe due to GTP hydrolysis-mediated conformational changes Synthesis and degradation of actin microfiaments is directional with g-actin subunits added only to the end of the microflament while depolymerization occurs at the end. QUESTION 3: From the list below salect the correct statements regarding the genetic code The basis of the genetic code are codons Cosons are formed by 5 consecutive nucleotides The genetic code has a possibile 64 different codem Codos code for 30 distinct amo acas The genetic code has built in degeneracy
- What triggers the movement of the thin filament? Is it because of the high --> low energy configuration? The exact mechanism is confusing to me.Actin filaments have a defined polarity. What is filament polarity? How is it generated at the subunit level?QUESTION 13 What is the mechanism by which microtubules can rapidly shrink, or undergo â catastrophe?â A At low levels of ATP, tubulin subunits are not added to the + end of the microtubule. B At low levels of GTP, beta-tubulin subunits at the + end of the microtubule hydrolyze GTP, undergo a conformational change, and destabilize the filament so that the filament starts to disassemble from the + end. C At low levels of GTP, tau proteins are phosphorylated and bind to the microtubule to destabilize the + end. D At high levels of GTP, tubulin subunits are more quickly added to the â end than to the + end of the microtubule, resulting in a shrinking + end of the microtubule. E At low levels of ATP, the microtubules rapidly disassemble since ADP-bound tubulin subunits are lost at both the + and â ends of the filament.
- QUESTION 7 Which of the following filaments has the highest tensile strength? A Actin filaments B Microtubules C Intermediate filaments D All of the above E None of the aboveWhat would be the consequence for actin filament assembly/disassembly if a mutation prevented actin’s ability to bind ATP? What would be the consequence if a mutation prevented actin’s ability to hydrolyze ATP?Question 10 What do synaptic vesicles of a neuromuscular junction contain? a serotonin b sodium c acetylcholine d calcium
- Actin filaments at the leading edge of a crawling cell are believed to undergo treadmilling. What is treadmilling, and what accounts for this assembly behavior?QUESTION 11 What is the molecular explanation for the observation that the I band appears to shorten in a muscle sarcomere that is undergoing contraction? A The actin filaments shorten. B The sarcomere is disassembled. C a and b D The myosin filaments walk along the actin filaments towards the Z-line to increase the amount of overlap between actin and myosin. E The myosin filaments shorten.QUESTION 10 Which of the following is NOT true of intermediate filaments? A They provide mechanical strength to cells. B They are composed of 8 oppositely oriented tetramers that are assembled into a rope-like filament. C They have a non-polar orientation. D They are rigid and do not deform before breaking E Keratins, neurofilaments, vimentin, and desmin are examples of intermediate filaments.