Which of the following would help achieve high affinity adherens junction binding between neighboring cells? Addition of both myosin Il and Rac GTPase Addition of more Ca2+ ions Addition of more myosin II Addition of more Rac GTPase All of the answers would help achieve high affinity binding
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- Which of the following is NỘT true of the mechanism by whldh kiesin motor proteins walk along microtubules? Kinesin molecules bind to other kinesin molecules as their cargo One foot, or head, domain of kinesin is always attachhed to the miarotubule Kinesin functions as a dimer. Kinesin dimers function autonomously (l.e. each molecule is bound to one molecule of cargo) Kinesin molecules are plus end-directed motor proteins A Moving to the next question prevents changes to this answer.Which of the following statements regarding kinesin are TRUE? (More than one answer is correct) Group of answer choices The majority of kinesin family members move along microtubules toward the (-) end Differential affinity of ATP- and ADP-bound kinesin for microtubules is important for kinesin walking The coiled-coil structure that links the two myosin motor proteins unwind after each step, requiring kinesin to periodically pause during transport and reenergize using ATP hydrolysis Kinesin movement is reminiscent of an inebriated individual walking (and carrying a balloon!)The ATPase activity of myosin protein is found in, Select one: O a. Its tail region O b. Its cytoplasm Oc. Its head region O d. Its cell membrane
- What sort of cellular changes would you expect a sailor sick with scurvy to experience? O Their collagen (an extracellular matrix component) would be diminished, resulting in fewer binding sites for integrins. The end result would be less adherent cells. O Their collagen (a cytoskeletal fiber) would be diminished, resulting in a loss of contractile motion within the cell, affecting both cell migration and muscle function.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.hich of the following statements is true about actin: OActin is translated by free ribosomes O Dyneins move toward the minus end of actin filaments actin can bind to GTP O actin filament is stabilized by ADP-binding
- Action potential enters from adjacent cell. Ca2+ 2 K* 3 Na+ Ca2+ ECF ATP NCX ICF 3 Na+ RyR Ca2+ Sarcoplasmic reticulum (SR) SR L-type Ca2+ Ca2+ channel Ca2+ stores ATP T-tubule Ca2+ sparks Ca2+ signal Ca2+ Ca2+ Actin eereee 33335 Myosin Contraction Relaxation Copyright 2009 Pearson Education, Inc. 1. Explain what is going on in steps 1-6. 2. Explain what transport proteins are involved is getting Ca2+ out of the cytosol. 3) Purple foxglove is a plant containing chemicals that slow the activity of the Ca2+-Na+ antiport. What will ingestion of purple foxglove increase or decrease levels of Na+ in the ICF?In nonmuscle cell locomotion, which protein is activated to nucleate a filament? Arp2/3 Vinculin Gelsolin Profilin Cofilinmbing fiber depolarizes mbrane potential to en Ca2+ channels. tage-gated channel 2+ Ca²+ Release 2+ Ca²+ Endoplasmic reticulum removal of AMPA receptors from the postsynaptic membrane. insertion of AMPA receptors into the postsynaptic membrane O increase in intracellular Ca2+ via voltage-gated Ca2+ channels O DAG- and Ca2+-mediated activation of PKC increase in intracellular Ca2+ via endoplasmic reticulum IP3 receptors
- When nerve cells contact each other, they form adherens junctions (AJs) at the point of contact. The main transmembrane (TM) protein in the junctions is N-cadherin. N-cadherin is a single pass TM protein with a short intracellular domain and a large extracellular domain on the amino end. Proper formation of the AJs requires both actin (MF) and microtubules (MTs). Motor proteins for MTs are dynein (-) end and kinesin (+) end (and were discovered by Michael Sheetz). Maintenance of preformed AJs requires MFs . Adding drugs that disrupt MFs causes AJs to fall apart, and the N-cadherin is removed from the PM (by endocytosis). If the drugs are removed, MTs (& MFs) are required to restore the N-cadherin to the plasma membrane. choose answer for D1 and D2 D. Suppose cells contain a soluble kinase that modifies N-cadherin that has been removed from the PM. D-1. The kinase could catalyze modification(s) of the side chains of amino acids near (the N end) (the C end) (either end, but not…Given the effect of myosin heavy chain phosphorylation on myosin II assembly/disassembly, why might it make sense to find this kinase near the contractile ring as the process of cell division is concluding?Which of the followings is filament-bundling proteins? Сapz alpha-actinin and fimbrin O thymosin beta4 Spectrin