Lesson 5 - Eukaryotic cells 3

Question 1

meaning cell wall

Answer 1

a freely permeable wall around plant cells, made mainly of cellulose

Question 2

meaning suberin

Answer 2

a chemical that impregnates cellulose cell walls in cork tissues and make them impermeable

Question 3

meaning middle lamella

Answer 3

the first layer of the plant cell wall to be formed when a plant cell divides, made mainly of pectin that binds the layer of cellulose together

Question 4

meaning pectin

Answer 4

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

Question 5

meaning primary cell wall

Answer 5

the first very flexible plant cell wall to form , with all the cellulose microfibrils orientated in the same direction

Question 6

meaning secondary cell wall

Answer 6

the older plant cell wall in which the cellulose microfibrils have built up at different angles to each other, making the cell wall more rigid

Question 7

meaning plant fibres

Answer 7

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

Question 8

meaning plasmodesmata

Answer 8

cytoplasmic bridges between plant cells that allow communication between cells

Question 9

meaning symplast

Answer 9

the interconnected cytoplasm of plant cells, connected by plasmodesmata

Question 10

which 2 substances build up on either side of the middle lamella

Answer 10

cellulose microfibrils and the matrix