L14 Plant cell wall structures and function

Question 1 of 22

1

Which of these is not an industrial use of the plant cell wall?

Select one of the following:

Human health
Renewable biofuels
Paper products
Clothing dye
These are all uses of the plant cell wall.

Explanation

Question 2 of 22

1

Choose the incorrect statement about the cell wall/plant cells.

Select one of the following:

The middle lamella is the "cement" inbetween cell's cell walls.
The middle lamella is mainly composed of pectin.
The primary cell wall is the innermost wall.
There are 3 layers in a secondary cell wall.

Explanation

Question 3 of 22

1

Cellulose is:
(Choose all correct.)

Select one or more of the following:

a glucose polymer
highly ordered
a branching molecule
long and ribbon like
the most abundant macromolecule on earth
a readily accessible source of high energy

Explanation

Question 4 of 22

1

Cellulose forms microfibrils which contain hydrogen bonds.

Select one of the following:

True
False

Explanation

Question 5 of 22

1

Choose the incorrect statement about the primary cell wall.

Select one of the following:

It is relatively thin and flexible.
It allows for growth.
It is about half (40-50%) cellulose and hemicellulose, with hemicellulose being more dominant.
It is about 35% pectin.
It is 5-10% protein, mainly extensin.

Explanation

Question 6 of 22

1

Pectin:
(Choose all correct.)

Select one or more of the following:

is a polysaccharide.
absorbs water.
resists compression.
is a disaccharide.
is hydrophobic.

Explanation

Question 7 of 22

1

There are ❌ phases of cell wall composition, plus a network of ❌. Firstly, a ❌ where cellulose is the main component. Secondly, a ❌ is formed of pectic ❌ and ❌ polysaccharides. Hemicellulose is a ❌ polysaccharide, with a ❌ sugar backbone, containing short ❌ chains of different sugars. It forms a rigid structure. Pectin is a ❌ and negatively charged polysaccharide.

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two

extensin

crystalline microfibrillar phase

non-crystalline matrix

hemicellulosic

polysaccharides

heterogenous

homogenous

single

multi

side

branched

straight chained molecule

Explanation

Question 8 of 22

1

Which of these is not an effect of extensin and cellulose cross linking.

Select one of the following:

Dehydration of the cell wall.
Increase in extensibility.
Increase of cell wall strength.
None of the above.

Explanation

Question 9 of 22

1

Complete the steps of cell wall synthesis.
1. ❌ are made and excreted by the ❌ to form the cell wall basis.
2. ❌ are processed/fully synthesized in the ❌ and leave in vesicles to the cell wall.
3. ❌ from the ❌ go through the Golgi and are sent to added the cell wall via vesicles.
Note: all vesicles fuse to the plasma membrane.

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Cellulose microfibrils

Polysaccharides pectin and hemicellulose

Proteins e.g. extensins

plasma membrane

Golgi

rough endoplasmic reticulum

Explanation

Question 10 of 22

1

Cellulose is synthesized by a multi sub unit complex, which contains the enzyme ❌. Sucrose is spilt into it's components of ❌ and glucose. Glucose is used to make ❌ while sucrose remains in the ❌.

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cellulose synthase

fructose

cellulose

cytosol

Explanation

Question 11 of 22

1

Choose the incorrect statement about the cell wall synthesis process.

Select one of the following:

Cellulose synthase sits in the plasma membrane.
Cellulose synthase is attached to the cytoskeleton's cortical microtubules.
Cellulose microfibrils are produced by cellulose synthase.
Cellulose microfibrils run perpendicular to the cortical microtubules.

Explanation

Question 12 of 22

1

Randomly oriented cellulose microfibrils causes the cell to expand in all directions.

Select one of the following:

True
False

Explanation

Question 13 of 22

1

Microfibrils perpendicular to the long axis of the cell will cause the cell to expand horizontally.

Select one of the following:

True
False

Explanation

Question 14 of 22

1

Infected cells will produce:

Select one of the following:

fungicide-containing fusion bodies
fungicide-containing inclusion bodies
fungicide-resisting fusion bodies
fungicide-resisting inclusion bodies

Explanation

Question 15 of 22

1

When cells receive a signal from an adjacent infected cell, they will:

Select one of the following:

carry out programmed cell death
release fungicide into their cytoplasm
release fungicide into their cell walls

Explanation

Question 16 of 22

1

Choose the correct statement about the secondary cell wall.

Select one of the following:

It is weaker and thinner than the primary wall.
All plant cells have a secondary wall.
It is produced after cell growth has stopped.
It provides additional support to the primary cell wall.

Explanation

Question 17 of 22

1

The secondary cell wall:

Select one of the following:

has multiple layers, with microfibrils aligned in the same direction
has a single layer, with microfibrils aligned in the same direction
has multiple layers, with microfibrils aligned in different directions
has a single layer, with microfibrils aligned in the different directions

Explanation

Question 18 of 22

1

Choose the correct statements about the secondary cell wall.

Select one or more of the following:

It has more cellulose than the primary cell wall.
It has more pectin than the primary cell wall.
15 to 35 percent of it is lignin.

Explanation

Question 19 of 22

1

Select from the dropdown lists to complete the text.

Lignin is found in ( secondary, primary ) cell walls and is the ( second most, most ) abundant macromolecule on earth. It is a complex phenolic ( polymer, monomer ) which confers strength, ( rigidity, flexibility ) and ( hydrophobicity, hydrophilicity ).

Explanation

Question 20 of 22

1

A grouping of plasmodesmata is called a:

Select one of the following:

pitfield
pore field
desmozone

Explanation

Question 21 of 22

1

Plasmodesmata allow cell to cell ❌ via channels which connect ❌. The plasma membrane around these pores is ❌ from one cell to another. The plasmodesmata are small enough to prevent ❌ movement but large enough to allow the free exchange of ❌. The endoplasmic reticulum can ❌ the plasmodesmata to ❌ between cells.

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communication

cytoplasm

continuous

organelle

small molecules

penetrate

bridge

Explanation

Question 22 of 22

1

Choose the correct options.

Select one or more of the following:

Viruses can move through plasmodesmata by drifting.
Viruses need gating/movement proteins to move through plasmodesmata.
Alfalfa mosaic virus and potato leafroll virus are an exception to this method of infection.
Alfalfa mosaic virus and potato leafroll virus are an example of this method of infection.

	Created by Mer Scott almost 7 years ago

• 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.

L14 Plant cell wall structures and function

Question 1 of 22

Which of these is not an industrial use of the plant cell wall?

Select one of the following:

Explanation

Question 2 of 22

Choose the incorrect statement about the cell wall/plant cells.

Select one of the following:

Explanation

Question 3 of 22

Cellulose is: (Choose all correct.)

Select one or more of the following:

Explanation

Question 4 of 22

Cellulose forms microfibrils which contain hydrogen bonds.

Select one of the following:

Explanation

Question 5 of 22

Choose the incorrect statement about the primary cell wall.

Select one of the following:

Explanation

Question 6 of 22

Pectin: (Choose all correct.)

Select one or more of the following:

Explanation

Question 7 of 22

Drag and drop to complete the text.

Explanation

Question 8 of 22

Which of these is not an effect of extensin and cellulose cross linking.

Select one of the following:

Explanation

Question 9 of 22

Drag and drop to complete the text.

Explanation

Question 10 of 22

Cellulose is synthesized by a multi sub unit complex, which contains the enzyme ❌. Sucrose is spilt into it's components of ❌ and glucose. Glucose is used to make ❌ while sucrose remains in the ❌.

Drag and drop to complete the text.

Explanation

Question 11 of 22

Choose the incorrect statement about the cell wall synthesis process.

Select one of the following:

Explanation

Question 12 of 22

Randomly oriented cellulose microfibrils causes the cell to expand in all directions.

Select one of the following:

Explanation

Question 13 of 22

Microfibrils perpendicular to the long axis of the cell will cause the cell to expand horizontally.

Select one of the following:

Explanation

Question 14 of 22

Infected cells will produce:

Select one of the following:

Explanation

Question 15 of 22

When cells receive a signal from an adjacent infected cell, they will:

Select one of the following:

Explanation

Question 16 of 22

Choose the correct statement about the secondary cell wall.

Select one of the following:

Explanation

Question 17 of 22

The secondary cell wall:

Select one of the following:

Explanation

Question 18 of 22

Choose the correct statements about the secondary cell wall.

Select one or more of the following:

Explanation

Question 19 of 22

Select from the dropdown lists to complete the text.

Explanation

Question 20 of 22

A grouping of plasmodesmata is called a:

Select one of the following:

Explanation

Question 21 of 22

Cellulose is:
(Choose all correct.)

Pectin:
(Choose all correct.)