Test
The Cytoskeleton
Este test tiene tipos de pregunta que se abren en el reproductor de siempre.
Preguntas del test (23)
1What is the monomer unit of actin microfilaments?
- AG-actin
- BF-actin
- CM-actin
- DActin 1
2What facilitates the polymerisation of G-actin to F-actin?
- AATP hydrolysis
- BGTP hydrolysis
- CPhosphorylation by protein kinase
- DActin polymerase enzyme
3In what orientation are actin monomers composed in f-actin?
- AHead to tail
- BHead to head
- CTail to tail
4Actin microfilaments are described as polar whereby monomers will be added to one end at a faster rate than the other
- AVerdadero
- BFalso
5What are the functions of the actin microfilaments? Check all that apply
- AMuscle contraction
- BMechanical support e.g. in microvilli
- CMaintenance of cell shape
- DCell movement
- EMovement of cargo within cell
- FCilia formation
6Non-muscle cells can contain actin and myosin networks. The interactions between filaments in these networks facilitates process within cells such as cytokinesis.
- AVerdadero
- BFalso
7Lamellipodia are extensions of the cytoplasm containing [blank_start]actin[blank_end] networks. They are generated by the rapid growth of actin filaments at the pole closest to the [blank_start]membrane[blank_end]. This produces [blank_start]force[blank_end] which causes the cytoplasm to protrude outwards. The tip of each lamellipodium interacts with the ECM via [blank_start]integrin[blank_end] protein. [blank_start]Myosin[blank_end] filaments within the cell faciliate contraction that aids movement.
- Aactin
- Bmembrane
- Cforce
- Dintegrin
- EMyosin
8The structure of intermediate filaments is dynamic.
- AVerdadero
- BFalso
9Intermediate filament monomers join in pairs to form helical [blank_start]dimers[blank_end] twisted around one another. Then, two dimers combine to form a [blank_start]tetramer[blank_end]. Tetramers then link in a [blank_start]staggered[blank_end] formation longitudinally to form a bundle of monomers forming the filament.
- Adimers
- Btetramer
- Cstaggered
10Tubulin monomers are heterodimers of a-tubulin and B-tubulin
- AVerdadero
- BFalso
11What facilitates the depolymerisation of microtubules to tubulin monomers?
- AGTP hydrolysis
- BATP hydrolysis
- CPhosphorylation
- DMethylation
- ETubulin hydrolase
12Microtubules are dynamic structures whereby the positive end refers to where construction occurs more rapidly than destruction
- AVerdadero
- BFalso
13What are the functions of the microtubules? Check all that apply
- AResit compression
- BSpindle formation
- CForm cilia and flagella
- DOrganise organelles
- EMovement of cargo within cell
- FWhole-cell movement
14What is a microtubule organisation centre (MTOC)?
- AA structure from which microtubules extend
- BA protein which organises microtubule polymerisation
- CA protein which gathers protofilaments at their centres to bundle them into microtubules
15The centrosome is a type of Microtubule Organisation Centre. A centrosome contains a pair of [blank_start]centrioles[blank_end]. A centriole consists of stable fused [blank_start]microtubules[blank_end]. Centrosomes form at the [blank_start]poles[blank_end] of cells. [blank_start]Aster[blank_end] microtubules attach the centrosome to the [blank_start]cell membrane[blank_end].
- Acentrioles
- Bmicrotubules
- Cpoles
- DAster
- Ecell membrane
16What is the name given to the protein that develops around the centromere of each chromosome to which spindle fibres attach?
- AKinetochore
- BKinetosome
- CKinetoprotein
17Which protein associated with microtubules moves towards the positive end of the microtubule at the cell periphery?
- AKinesin
- BDynein
18Which protein associated with microtubules moves towards the negative end of the microtubule at the nucleus?
- AKinesin
- BDynein
19When proteins move cargo throughout the cell, they do so via the [blank_start]microtubules[blank_end] of the cytoskeleton. These proteins are composed of double [blank_start]helices[blank_end] which allow roation. Each 'head' can attach to the microtubule when bound to [blank_start]ATP[blank_end]. When ATP is hydrolysed, there is a [blank_start]power stroke[blank_end] where the angle of the head changes and the cargo moves along the microtubule. Then, the second head binds and the process repeats.
- Amicrotubules
- Bhelices
- CATP
- Dpower stroke
20What is the structure of a cilium?
- ARing of 9 microtubule doublets with a single microtubule doublet in the centre
- BRing of 8 microtubule doublets with 2 microtubule doublets in the centre
- CRing of 9 microtubule doublets
- DRing of 9 microtubule triplets
21What is the name given to the structure of the MTOC found near the cell membrane that provides a template for cilia assembly?
- ABasal body
- BBasal centromere
- CKinetic body
- DKinetochore
22All cells have a single primary cilium. This cilium is not [blank_start]motile[blank_end] and is thought to [blank_start]conduct[blank_end] cell signalling pathways. It must be [blank_start]disassembled[blank_end] before mitosis can occur.
- Amotile
- Bconduct
- Cdisassembled
23Which cell junctions form junctions between cells connected to the cytoskeleton?
- ADesmosomes
- BGap junctions
- CHemidesmosomes
- DFocal adhesions
- ETight junctions
Información
- Descripción
- Cell Biology and Signalling Test sobre The Cytoskeleton, creado por Charlotte Jakes el 01/11/2019.
- Autor
- Charlotte Jakes
- Idioma
- English
- Visitas
- 824
- Etiquetas
- Valoración
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