Quiz
L14 Plant cell wall structures and function
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Questions in this quiz (22)
1Which of these is not an industrial use of the plant cell wall?
- AHuman health
- BRenewable biofuels
- CPaper products
- DClothing dye
- EThese are all uses of the plant cell wall.
2Choose the incorrect statement about the cell wall/plant cells.
- AThe middle lamella is the "cement" inbetween cell's cell walls.
- BThe middle lamella is mainly composed of pectin.
- CThe primary cell wall is the innermost wall.
- DThere are 3 layers in a secondary cell wall.
3Cellulose is:
(Choose all correct.)- Aa glucose polymer
- Bhighly ordered
- Ca branching molecule
- Dlong and ribbon like
- Ethe most abundant macromolecule on earth
- Fa readily accessible source of high energy
4Cellulose forms microfibrils which contain hydrogen bonds.
- ATrue
- BFalse
5Choose the incorrect statement about the primary cell wall.
- AIt is relatively thin and flexible.
- BIt allows for growth.
- CIt is about half (40-50%) cellulose and hemicellulose, with hemicellulose being more dominant.
- DIt is about 35% pectin.
- EIt is 5-10% protein, mainly extensin.
6Pectin:
(Choose all correct.)- Ais a polysaccharide.
- Babsorbs water.
- Cresists compression.
- Dis a disaccharide.
- Eis hydrophobic.
7There are [blank_start]two[blank_end] phases of cell wall composition, plus a network of [blank_start]extensin[blank_end]. Firstly, a [blank_start]crystalline microfibrillar phase[blank_end] where cellulose is the main component. Secondly, a [blank_start]non-crystalline matrix[blank_end] is formed of pectic [blank_start]polysaccharides[blank_end] and [blank_start]hemicellulosic[blank_end] polysaccharides. Hemicellulose is a [blank_start]heterogenous[blank_end] polysaccharide, with a [blank_start]single[blank_end] sugar backbone, containing short [blank_start]side[blank_end] chains of different sugars. It forms a rigid structure. Pectin is a [blank_start]branched[blank_end] and negatively charged polysaccharide.
- Atwo
- Bextensin
- Ccrystalline microfibrillar phase
- Dnon-crystalline matrix
- Ehemicellulosic
- Fpolysaccharides
- Gheterogenous
- Hhomogenous
- Isingle
- Jmulti
- Kside
- Lbranched
- Mstraight chained molecule
8Which of these is not an effect of extensin and cellulose cross linking.
- ADehydration of the cell wall.
- BIncrease in extensibility.
- CIncrease of cell wall strength.
- DNone of the above.
9Complete the steps of cell wall synthesis.
1. [blank_start]Cellulose microfibrils[blank_end] are made and excreted by the [blank_start]plasma membrane[blank_end] to form the cell wall basis.
2. [blank_start]Polysaccharides pectin and hemicellulose[blank_end] are processed/fully synthesized in the [blank_start]Golgi[blank_end] and leave in vesicles to the cell wall.
3. [blank_start]Proteins e.g. extensins[blank_end] from the [blank_start]rough endoplasmic reticulum[blank_end] go through the Golgi and are sent to added the cell wall via vesicles.
Note: all vesicles fuse to the plasma membrane.- ACellulose microfibrils
- BPolysaccharides pectin and hemicellulose
- CProteins e.g. extensins
- Dplasma membrane
- EGolgi
- Frough endoplasmic reticulum
10Cellulose is synthesized by a multi sub unit complex, which contains the enzyme [blank_start]cellulose synthase[blank_end]. Sucrose is spilt into it's components of [blank_start]sucrose[blank_end] and glucose. Glucose is used to make [blank_start]cellulose[blank_end] while sucrose remains in the [blank_start]cytosol[blank_end].
- Acellulose synthase
- Bfructose
- Ccellulose
- Dcytosol
11Choose the incorrect statement about the cell wall synthesis process.
- ACellulose synthase sits in the plasma membrane.
- BCellulose synthase is attached to the cytoskeleton's cortical microtubules.
- CCellulose microfibrils are produced by cellulose synthase.
- DCellulose microfibrils run perpendicular to the cortical microtubules.
12Randomly oriented cellulose microfibrils causes the cell to expand in all directions.
- ATrue
- BFalse
13Microfibrils perpendicular to the long axis of the cell will cause the cell to expand horizontally.
- ATrue
- BFalse
14Infected cells will produce:
- Afungicide-containing fusion bodies
- Bfungicide-containing inclusion bodies
- Cfungicide-resisting fusion bodies
- Dfungicide-resisting inclusion bodies
15When cells receive a signal from an adjacent infected cell, they will:
- Acarry out programmed cell death
- Brelease fungicide into their cytoplasm
- Crelease fungicide into their cell walls
16Choose the correct statement about the secondary cell wall.
- AIt is weaker and thinner than the primary wall.
- BAll plant cells have a secondary wall.
- CIt is produced after cell growth has stopped.
- DIt provides additional support to the primary cell wall.
17The secondary cell wall:
- Ahas multiple layers, with microfibrils aligned in the same direction
- Bhas a single layer, with microfibrils aligned in the same direction
- Chas multiple layers, with microfibrils aligned in different directions
- Dhas a single layer, with microfibrils aligned in the different directions
18Choose the correct statements about the secondary cell wall.
- AIt has more cellulose than the primary cell wall.
- BIt has more pectin than the primary cell wall.
- C15 to 35 percent of it is lignin.
19Lignin is found in [blank_start]secondary[blank_end] cell walls and is the [blank_start]second most[blank_end] abundant macromolecule on earth. It is a complex phenolic [blank_start]polymer[blank_end] which confers strength, [blank_start]rigidity[blank_end] and [blank_start]hydrophobicity[blank_end].
- Asecondary
- Bprimary
- Csecond most
- Dmost
- Epolymer
- Fmonomer
- Grigidity
- Hflexibility
- Ihydrophobicity
- Jhydrophilicity
20A grouping of plasmodesmata is called a:
- Apitfield
- Bpore field
- Cdesmozone
21Plasmodesmata allow cell to cell [blank_start]communication[blank_end] via channels which connect [blank_start]cytoplasm[blank_end]. The plasma membrane around these pores is [blank_start]continuous[blank_end] from one cell to another. The plasmodesmata are small enough to prevent [blank_start]organelle[blank_end] movement but large enough to allow the free exchange of [blank_start]small molecules[blank_end]. The endoplasmic reticulum can [blank_start]penetrates[blank_end] the plasmodesmata to [blank_start]bridge[blank_end] between cells.
- Acommunication
- Bcytoplasm
- Ccontinuous
- Dorganelle
- Esmall molecules
- Fpenetrate
- Gbridge
22Choose the correct options.
- AViruses can move through plasmodesmata by drifting.
- BViruses need gating/movement proteins to move through plasmodesmata.
- CAlfalfa mosaic virus and potato leafroll virus are an exception to this method of infection.
- DAlfalfa mosaic virus and potato leafroll virus are an example of this method of infection.
Information
- Description
- • Describe the primary plant cell wall synthesis, composition, structure and function. • Describe the structure and function of the secondary plant cell wall. • Define the term plasmodesmata and outline the role these structures play in cellular communication and viral spread.
- Author
- Mer Scott
- Language
- English
- Views
- 21
- History
- Created on 21 May 2017 · updated on 22 May 2017
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