2.5 Ultrastructure of plant cells

Question 1

describe the cell wall in plants

Answer 1

• made up of cellulose
• freely permeable
• give it shape and make it rigid
• act as defence mechanism

Question 2

describe vacuoles

Answer 2

• membrane lines sacs with cell sap
• maintain turgor
• membrane = tonoplast (selectivity permeable)

Question 3

structure of chloroplasts

Answer 3

• double membrane
• stroma = fluid enclosed
• internal network of membranes form thylakoids (flattened sacs)
• granum = stack of thylakoids
• internal membrane = large SA
• starch grains
• grana = contain chlorophyll pigments
• DNA and ribosomes so make their own protein

Question 4

function of chloroplasts

Answer 4

site of photosynthesis

Question 5

what are fungal cell walls made of

Answer 5

chitin

Question 6

what are bacterial cell walls made of

Answer 6

peptidoglycan