BIOL 4100 TEST 4 EXAM QUESTIONS AND ANSWERS WITH COMPLETE SOLUTIONS VERIFIED LATEST UPDATE
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Course
BIOL4100
Institution
BIOL4100
BIOL 4100 TEST 4 EXAM QUESTIONS AND ANSWERS WITH COMPLETE SOLUTIONS VERIFIED LATEST UPDATE
Muscle contraction is triggered by nerve impulses which stimulate release of ______ from _______
Ca2+; sarcoplasmicreticulum
Increased Ca2+ affects 2 actin filament binding proteins:
tropomyosin and tro...
In non-muscle cells, contractile assemblies are similar to
muscle fibers
Examples of contractile assemblies:
Stress fibers and adhesion belts
Displacement is ______ dependent
myosin
Myosin 5
Lower force generation + Longer steps = Efficiency
Myosin VI
walks in opposite direction (-) direction
Myosin directionality is defined by
lever arms and converter domain
, Microtubules are______ that undergo _______
rigid hollow rods; continual assembly and disassembly
Microtubules functions
cell movements and determining cell shape.
_______ polymerize to form microtubules: ______ protofilaments around a _____
core
Tubulin dimers; 13; hollow
Protofilaments are _____ arrays of tubulin dimers arranged ____
head-to-tail; parallel
What determines the direction of movement?
polarity (plus and minusends)
What are microtubules made of?
globular protein tubulin
Tubulin dimers consist of
α-tubulin and β-tubulin, which are encodedby related genes.
Microtubular lattice is imperfect. True of False
True (discontinuity exists in the microtubule wall; a seam which is a weak point)
The are two types of microtubules in the cell:
-axonemal
-non axonemal
axonemal microtubules
-form cytoskeletal part of cilia and flagella
-easy to purify
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