ASU BIO 353 Exam 2 Study Guide

ASU BIO 353 Exam 2 Study Guide Actin Filaments - Ans:-have a diameter of 7 nm and contain 375 amino acids. Actin filaments will - Ans:-two of the above The number of amino acids in an actin monomer is - Ans:-375 Hydrolysis of ATP to ADP - Ans:-helps identify the assembly vs the disassembly end Actin filaments associate with a nucleotide triphosphate - Ans:-True Treadmilling of actin filaments only occurs in a test tube. - Ans:-False Preassembled nucleation sites in a living cell are equivalent to the intracellular preference for actin filaments - Ans:-True Intracellular preference for actin filaments - Ans:-Is a way to look at the geography of the cell and show where the role of actin filaments is important. The ability of actin filaments to disassemble into small monomers: - Ans:-Two of the above ©GRACEAMELIA 2024/2025 ACADEMIC YEAR. ALL RIGHTS RESERVED FIRST PUBLISH OCTOBER 2024 Page 2/7 What causes a myosin II molecule to be able to form a bipolar fiber? - Ans:-Calcium binding to calmodulin. The diameter of the actin filaments is ______ nm. - Ans:-7 Actin filaments will only assemble in parallel bundles. - Ans:-False The monomer of tubulin: - Ans:-is a heterodimer with a total molecular weight of 110 kDa. Treadmilling can occur: - Ans:-in a test tube for actin filaments and microtubules. Molecular motors working with microtubules: - Ans:-are calcium-dependent ATPases Dynein is a molecular motor that: - Ans:-moves cargo to the centrosome To move cargo from one side of the cell to the other, the sequence would be in the following order: - Ans:-dynein, centrosome, kinesin The electron dense cloud surrounding the centrioles in animal cells contains nucleation sites for: - Ans:-MTs made of gamma tubulin The 9+0 configuration refers to ________, and is found only in _______ cells. - Ans:-centrioles animal At steady state equilibrium, microtubules in a test tube have a _____ and _____ end. - Ans:-assembly ©GRACEAMELIA 2024/2025 ACADEMIC YEAR. ALL RIGHTS RESERVED FIRST PUBLISH OCTOBER 2024 Page 3/7 disassembly In a living cell, which end of the microtubule is effectively capped? - Ans:-Disassembly end The intracellular preference for microtubules is - Ans:-the centrosome Gamma-tubulin is present in ...... - Ans:-The centrosome The outer diameter of a microtubule is _____ nm. - Ans:-25 The dynactin complex acts only on actin filaments. - Ans:-False The barrier function of an epithelium extends the role of the plasma membrane over a larger surface area. - Ans:-True Desmosome junctions are calcium-dependent but cadherin junctions are not. - Ans:-False A hemidesmosome connects one cell to another. - Ans:-False Gap junctions in plant cells cannot close. - Ans:-True Nuclear lamins differs in all the different cell types of an organism: - Ans:-False Desmin is present in muscle cells. - Ans:-True In neurons, actin filaments are really intermediate filaments. - Ans:-Fals