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cell bio- old midterms
old mideterm Qs
43
Biology
Undergraduate 1
11/08/2010

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Term
According to the Endosymbiont Theory, the orgalle propsed to ahve eveolved from a cyanobacterium engulfed by an early heteroptrophic eukaryote is?
Definition
a chloroplast
Term
Draw and label a hemidesmosome
Definition
[image]
Term
Describe struture of microfilament. use diagram to assist.
Definition

structure composed of actin, form of alpha helix, dissambles as wel as assembling "treadmilling", binds ATP/ADP

 

[image]

Term
Describe process of microfilament treadmilling.
Definition
  • G actin monomers bind with ATP in filament
  • ATP gets hydrolyzed and ATP becomes ADP and monomers start to break off
Term
The calss of actin binding proteins that plays a role similar to that of the percentriolar material for that of microtubules is?
Definition
actin nucleating protiens
Term
What is name of this structure?[image]
Definition
desmosomes
Term
Component of animal extracellular matrix that palys a role similar to that of hemicellulose in plant cell wall is
Definition
fibronectin/laminin
Term
Name for circular assembly of six indentical intergral membrane proteins which form a gap junction is
Definition
connexon
Term
Strucutre in plant cell wihc plays a similar role to gap junction in animal cell is?
Definition
plasmodesmata
Term
The structure that directs the movement of the particle rosettes is?
Definition
intracellular microtubules
Term
Type of cytoskeletal element that posses heterogenity in its amino acid compostion is?
Definition
Intermediate filaments
Term
Name of minus end directed protein associtated with microtubules is?
Definition
Dyenin
Term
Function of procollagen peptidase is?
Definition
to remove amino acid and carboxyl terminal ends of collagen alpha chains to allow assmebly of collagen molecules
Term
The molecule that is composed of 3 long polypeptides with several globular domains for binding other molecules is?
Definition
laminin
Term
Washing Ca2+ away from tissues disruptes the function of?
Definition
desmosomes
Term
The type of molecule that possess homophilic binding properties which allow 'mixed' cells to be sorted during development in order to form tissues is?
Definition
intermediate filiaments
Term
Structure which helps form blood-brain barrier by preventing flow of solutes between neighbouring cells is?
Definition
tight junctions
Term
The drug which results in stabilization of microfiliament is?
Definition
phailoidin
Term
The ____ end of a _____ is associated with the centrosome.
Definition
The minus end of a microtubule is assoicated with the centrosome.
Term
according to endosymbiotic theroy, which organelle is proposed to have evolved from a cynobactrium englufed by an early heterotrophic eukaryote?
Definition
chloroplast
Term
_________ provies high tensile strength in the extraceullular matrix of animal cells and _____ plays a simliar role in the plant cell wall.
Definition
collogen provides high tensile strength in the extracellular matrix of animal cells and cellulose plays a simliar role in the plant cell wall.
Term
What is the function of procollagen peptidase
Definition
Removes the amino and carboxyl termianl ends of collagen alpha chians to allow assembly of collagen molecules
Term
What is most likely to be at the plus end of a microfilament
Definition
Actin ATP
Term
What are two functions of the basal lamina (basement membrane)?
Definition

provide base for cells to bind onto with hemidermpres

 

act as a barrier to macromolecules from crossing over the dermis and epiderms

Term
Type of integral membrane protein found in a desmosome
Definition
cadherins
Term
Type of plaque prtoein found in hemidesmisomes
Definition
plectin
Term
orientation of which type of plant cell wall is determined by mictubules
Definition
cellulose
Term
Which of cytoskeletal elemes is the smallest consisting of a solid filament with an outer diamter of approximaetly 8 nm?
Definition
microfilament
Term
The diffuse fibrous network surrounding the centrioles in a centrosome
Definition
pericentroler
Term
Which type of cytoskeletal element is most stable?
Definition
intermediate filament
Term
motor prtein associated with microfilaments
Definition
myosin
Term
Desrcibe what fibronectin conisits of
Definition
two polypeptides, each containing a series of globular domains which serve as binding sites
Term
What type of junction prevents the flow of molecules from one sdie of a cell layer to the other?
Definition
tight junctions
Term
What has its function dependent on Ca2+ ions?
Definition
desmosomes
Term
The ____ end of the _____ is assosiated with the centrosome
Definition
the minus end of the microtubule is assosiated with the centrosome
Term
What type of protein would connect microfilmanets to integrin
Definition
nucleating proteins (?)
Term
What is molecule composed of 3 long polypeptides with several globular domains for biniding other molecules?
Definition
laminin
Term
Which of the following is an intergral membrane prtoein found in desmoes?
Definition
desmoplakin
Term
Which of folowing is a ctyoplasmic plaque protein found in hemidesmomes?
Definition
plactin
Term
What molecule that is found in the extracellular matrix consists of two polypeptides attached together by disulfide bonds and contains several binding domains for other macromoelcues?
Definition
fibronecton
Term
What structure contains percicentries?
Definition
centrosomes
Term
Which drug binds to free tubulin heterodimers and causes their aggregation and the subsequent disassembly of microtubules?
Definition
vincristine
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