BIO 353 Exam #4 Worksheets Questions And Answers 2024/2025 Latest Tests
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Course
BIO 353
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BIO 353
BIO 353 Exam #4 Worksheets Questions And Answers 2024/2025 Latest Tests
Which of the following statements about actin is false? ANS The dynamic instability of actin filaments is important for cell movement
The hydrolysis of bound ATP to ADP in actin filament ________ the strength of binding be...
BIO 353 Exam #4 Worksheets Questions And Answers
Which of the following statements about actin is false? ANS The dynamic instability of actin
filaments is important for cell movement
The hydrolysis of bound ATP to ADP in actin filament ________ the strength of binding between
monomers in the filament. ANS Decreases
Actin at the cell cortex helps govern the shape of the plasma membrane. ANS True
Actin filaments are nucleated at the site of existing actin filaments in lamellipodia. ANS True
The thin sheetlike structures that a fibroblast regularly extends during cell crawling are called: ANS
Lamellapodia
Myosins are motor proteins that use the energy of ATP hydrolysis to move along actin filaments.
ANS True
Which of the following examples are characterized by having actin microfilaments arranged in
bundles of opposite polarities? ANS Contractile rings and adhesion belts
All of the following are examples are characterized by having actin microfilaments arranged in tight
bundles and thin sheets and are structurally polar except: ANS Stress fibers
Gel-like networks are characterized by having F-actin arranged in a loose yet highly viscous 3D open
array with many interconnections and mixed polarity. ANS True
__________ is a molecule derived from the very poisonous Amanita phalloides and promotes actin
polymerization by binding directly to and stabilizing the filaments. ANS Phalloidin
, _______ is an actin molecular motor that is crucial for the movement of opposite oriented F-actin; it
generates tension in stress fibers, contractile ring adhesion belts, and muscle contraction. ANS
Myosin II
The basal lamina is constructed from components supplied by different cell types, commonly by
epithelial cells on one side and fibroblasts on the other. ANS True
Proteoglycans in the extracellular matrix of animal tissues: ANS Help tissues resist mechanical
compression; allow cartilage to resist compression
General name for long, linear, highly charged polysaccharides composed of a repeating pair of
sugars, one of each is always an amino sugar that is found covalently linked to a protein core in the
extracellular matrix. ANS Glycosaminoglycan (GAGs)
Which are features of collagen structure? ANS -Triple helix
-Glycine rich polypeptide chains
-Single collagen alpha-chain forms a left handed helix
-Strong side-by-side interactions within the triple helix
Fibronectin is capable of linking which two proteins? ANS Collagen and integrins
Like many other extracellular proteins, newly synthesized collagen molecules undergo post-
translational processing inside the cell then convert them into their mature form, and are then
secreted and self-assembled into fibrils in the extracellular space. ANS False
Desmosome junctions are structurally similar to adherence junctions but link to intermediate
filaments instead of actin. ANS True
Which of the following statement about Myosin I and II function is false? ANS Myosin I at rear
of the cell causes cortical contraction which squeeze the tail thus pushes the cytosol forward
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