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Actin: Quiz


Question 1: Actin polymerization and depolymerization is necessary in ________ and cytokinesis.
InflammationChemotaxisBacteriaImmune system

Question 2: To allow cell motility (see Actoclampin molecular motors), including phagocytosis of bacteria by ________.
MacrophageMonocytePhagocyteWhite blood cell

Question 3: The ________ can also bind to actin filaments at 70 degrees to form new actin branches off of existing actin filaments.
KinesinCytoskeletonArp2/3 complexAdenomatosis polyposis coli

Question 4: The polarity of an actin filament can be determined by decorating the microfilament with ________ "S1" fragments, creating barbed (+) and pointed (-) ends on the filament.

Question 5: Actin is the monomeric subunit of two types of filaments in cells: microfilaments, one of the three major components of the ________, and thin filaments, part of the contractile apparatus in muscle cells.

Question 6: ________ have at least six actin isoforms coded by separate genes,[2 ] which are divided into three classes (alpha, beta and gamma) according to their isoelectric point.
Even-toed ungulateMammalMammal classificationPrimate

Question 7: In ________, actin is the major component of thin filaments, which, together with the motor protein myosin (which forms thick filaments), are arranged into actomyosin myofibrils.
Head and neck anatomyTorsoFasciaMuscle

Question 8: Actin is a globular, roughly 42-kDa protein found in all eukaryotic cells (the only known exception being ________ sperm) where it may be present at concentrations of over 100 μM.

Question 9: All non-spherical ________ appear to possess genes such as MreB, which encode homologues of actin; these genes are required for the cell's shape to be maintained.
BacteriaCyanobacteriaProkaryoteGram-positive bacteria

Question 10: In ________ cells to be the scaffold on which myosin proteins generate force to support muscle contraction.
Head and neck anatomyTorsoMuscleFascia

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