Eukaryotic cells 3 - Plant cell structures

Question 1

What type of shape does animal cells have

Answer 1

Almost any shape

Question 2

Plant cells tend to be what shape

Answer 2

Regular and uniform in the appreance

Question 3

Why are plant cell regular and uniform

Answer 3

cell is bounded by a cell wall

Question 4

What is the role of the cell wall

Answer 4

strength and support

Question 5

What is the cell wall made up of

Answer 5

largely insoluable cellouse

Question 6

What other features does the cell wall have

Answer 6

the cell wall is usually freely permabale to eveything that is dissolved in water - it does not act act as a barrier to substances getting into the cell

Question 7

How can the cell wall be impregnated

Answer 7

suberin in cork tissues
or with
lingin to produce wood

Question 8

Which compounds effect the permeability of the cell

Answer 8

suberin or lingin

Question 9

What is the middle lameel

Answer 9

the first layer of the plant cell wall to be formed when a plant cell divides made mainly of calcium pectate that binds the layes of cellouse together

Question 10

which layer forms when the plant cell divids into 2 new cells

Answer 10

The middle lameela

Question 11

What is pectin

Answer 11

a polysachharide that holds cell walls of neighbouring plant cells together and is part of the strucutre of the primary cell wall

Question 12

what is the middle layer made of

Answer 12

Pectin

Question 13

How is calcium pectate formed

Answer 13

pectin has lots of - charged carboxyl groups and these combine with + calcium ions to from calcium pectate

Question 14

What is one property of the cellouse microfribilis

Answer 14

These walls are very flexible

Question 15

What happens when the plant ages

Answer 15

secondary thickening may take place. A secondary cell wall builds up with the cellouse mircrofibrills laid densley at diffrent angles to each other.

Question 16

What happens when the mircrofibrilis is laid densley at diffrent angles to each other

Answer 16

makes the composite material much more rigid

Question 17

What are plant fibres

Answer 17

long cells with cellouse cell walls that have been heavily lignified so they are rigid and very strong

Question 18

What is the primary cell wall

Answer 18

is the first very flexible plant cell wall to form with all the cellouse microfibrills oerinated in a simallr direction

Question 19

What is the secondary cell wall

Answer 19

is the older plant cell wall in which the c

Question 20

What is plasmodesmata

Answer 20

Are cytoplasmic bridges between plant cells that aloow communication between the cells

Question 21

How does plasmodesmata form

Answer 21

as plant cells divide

Question 22

What do the threads of cytoplasm do

Answer 22

the threads pass through the cytoplasm, The interconnected cytoplasm of the cells is known as the symplast

Question 23

What is the symplast

Answer 23

interconnected cytoplasm of plant cells connected by the plasmdoesmata