4345447
Pregunta 1
Respuesta
-
Bacterial cell
-
Eukaryotic cell
-
plasma membrane
-
internal membrane
Pregunta 2
Pregunta
The plasma membrane is involved in ..
Respuesta
-
cell communication
-
import and export of molecules
-
cells growth
-
motility
-
protein reorganization
-
Ca2+ storage
Pregunta 3
Pregunta
The most common phospholipid in cell membranes
Respuesta
-
phosphatidylcholine
-
phosphatidylserine
-
phosphatidylglycerol
Pregunta 4
Respuesta
-
choline
-
phosphate
-
glycerol
-
nonpolar (hydrophobic tails)
-
polar (hydrophilic head)
-
double bond
Pregunta 5
Respuesta
-
energetically unfavorable
-
energetically favorable
Pregunta 6
Pregunta
The properties of the lipid bilayer ensure that the plasma membrane is extremely flexible and able to self repair
Respuesta
- True
- False
Pregunta 7
Pregunta
Membrane and proteins do not retain their orientation during transfer between cell compartments
Respuesta
- True
- False
Pregunta 8
Respuesta
-
lumen
-
cytosol
-
extracellular fluid
-
transport vesicle
-
membrane protein
-
plasma membrane
-
cytosolic face
-
non-cytosolic face
Pregunta 9
Respuesta
-
Transporters class
-
ion channels class
-
receptors class
-
anchors class
-
enzymes class
-
transporters and channels
-
anchors
-
receptors
-
enzymes
-
cytosol
-
extracellular fluid
Pregunta 10
Respuesta
-
transmembrane
-
Monolayer associated alpha helix
-
lipid-linked
-
protein-attached
-
cytoso
-
barrel
Pregunta 11
Pregunta
Because the backbone of a polypeptide chain is hydrophilic, a transmembrane polypeptide chain usually crosses the lipid bilayer as...
Respuesta
-
a helix
-
a beta-sheet
-
a coil
Pregunta 12
Pregunta
Many single-pass transmembrane proteins are receptors for extracellular signals
Respuesta
- True
- False
Pregunta 13
Respuesta
-
peptide bonds
-
alpha-helix
-
phospholipid
-
hydrogen bond
-
hydrophobic amino acid side chain
Pregunta 14
Pregunta
A transmembrane [blank_start]hydrophilic[blank_end] pore can be formed by [blank_start]multiple[blank_end] [blank_start]amphipathic[blank_end] α helices or β sheets
Respuesta
-
hydrophilic
-
hydrophobic
-
multiple
-
single
-
amphipathic
-
amphoteric
-
aliphatic
Pregunta 15
Respuesta
-
Hydrophilic
-
Hydrophobic
-
aqueous pore
-
transmembrane alpha-helix
-
Pore
-
Beta sheet
-
hydrophobic core of the lipid bilayer
-
lipid bilayer
Pregunta 16
Respuesta
-
apical plasma mebrane
-
lateral plasma mebrane
-
basal plasma membrane
-
protein A
-
tight junction
-
protein B
-
basal lamina
-
blood stream
Pregunta 17
Pregunta
The cytoskeleton
Respuesta
-
gives a cell its shape
-
allows the cell to organize its internal components
-
to move (‘bones and muscles’ of the cell)
-
protects the cell
-
gives pigmentation to the cell
Pregunta 18
Pregunta
How many types of protein filaments there are that form the cytoskeleton differ in their composition, mechanical properties, and roles inside the cell
Respuesta
-
3
-
4
-
5
-
2
-
6
Pregunta 19
Respuesta
-
Intermediate filaments
-
microtubules
-
actin filaments
Pregunta 20
Pregunta
Ropelike fibers with a diameter of about 10 nm, made of fibrous proteins, can form a nuclear lamina or extend across the cytoplasm giving the cells mechanical strength, very flexible, may have great tensile strength, deform under stress but do not rupture
Respuesta
-
intermediate filaments
-
microtubules
-
actin filaments
Pregunta 21
Pregunta
Hollow cylinders made of protein tubulin, long and straight, one end attached to centrosome, outer diameter of about 25nm, rigid, rupture when stretched
Respuesta
-
intermediate filaments
-
microtubules
-
actin filaments
Pregunta 22
Pregunta
helical polymers of a protein, flexible, diameter about 7 nm, organized into linear bundles, two-dimensional networks, highly concentrated in the cortex (layer beneath the plasma membrane.
Respuesta
-
intermediate filaments
-
microtubules
-
actin filaments
Pregunta 23
Respuesta
-
alpha-helical region of monomer
-
coiled-coil dimer
-
staggered tetramer of two coiled dimers
-
lateral association of 8 tetramers
-
addition of 8 tetramers to growing filam
Pregunta 24
Respuesta
-
bundles of intermediate filaments
-
desmosome connecting two cells
Pregunta 25
Pregunta
Intermediate filaments meet at demos ones and provide stability so you cannot rip it easily apart
Respuesta
- True
- False
Pregunta 26
Respuesta
-
keratin filaments
-
vimentin-related filaments and vimentin
-
neurofilaments
-
nuclear limins
-
in epithelial cells
-
in connective-tissue cells,muscle/glial
-
in nerve cells
-
in all animal cells
Pregunta 27
Respuesta
-
nondividing cell
-
dividing cell
-
ciliated cell
-
cilium
-
poles of mitotic spindle
-
centrosome
Pregunta 28
Pregunta
How many protofilaments make 1 microtubule
Respuesta
-
13
-
12
-
10
-
15
-
9
Pregunta 29
Pregunta
microtubules do not have structural polarity
Respuesta
- True
- False
Pregunta 30
Respuesta
-
protofilament
-
lumen
-
plus end
-
minus end
-
microtubule
-
tubulin heterodimer
Pregunta 31
Pregunta
Do microtubules have a direction
Respuesta
-
yes
-
no
Pregunta 32
Respuesta
-
pair of centrioles
-
basal bodies
-
y-tubulin ring complex
-
nucleating sites
-
centrosome matrix
Pregunta 33
Respuesta
-
nucleus
-
centrosome
-
growing microtubule
-
microtubule capping protein
-
unstable microtubules
-
stable microtubules
-
unpolarized cell
-
polarized cell
-
GTP hydrolysis
-
GTP-tubulin
-
GDP-tubulin
-
GTP-cap
-
dynamic instability
-
Growing microtubule
-
Shrinking microtubule
Pregunta 34
Respuesta
-
ATPase
-
tall
-
globular head
-
kinesin
-
dynein
-
plus end
-
minus end
Pregunta 35
Pregunta
Many hair like cilia project from the surface of the epithelial cells that line the human respiratory tract.
Respuesta
- True
- False
Pregunta 36
Respuesta
-
radial spoke
-
central singlet microtubule
-
outer dynein arm
-
inner dynein arm
-
bend
-
slide
-
+ATP
-
In isolated doublet microtubules
-
in a normal flagellum
Pregunta 37
Pregunta
thin, flexible protein threads with a polarized structure
Respuesta
-
actin filaments
-
microtubules
-
intermediate filaments
Pregunta 38
Respuesta
-
actin with bound ATP
-
Actin with bound ADP
-
Treadmilling
-
Actin monomer
-
plus end
-
minus end
-
actin filament
Pregunta 39
Respuesta
-
actin cortex
-
lamellipodium
-
substratum
-
myosin motor protons slide actin fil.
-
focal contacts
-
Further protrusion
-
Attachment
-
Contraction
-
cortex under tension
-
movement of unpolymerised actine
-
actin polymerization
Pregunta 40
Respuesta
-
head
-
tail
-
+
-
-
-
vesicle
-
myosin-I
-
plasma membrane
Pregunta 41
Respuesta
-
myosin-II molecule
-
myosin-II filament
-
myosin heads
-
bare region
-
myosin-II
-
plasma membrane
Pregunta 42
Respuesta
-
nucleus
-
myofibril
-
sarcomere
-
Z disc
-
overlap region
-
thick filament (myosin-II)
-
Thin filament(actin)
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