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