Ultrastructure Of Plant Cells

Question 1

Chloroplasts

Answer 1

-surrounded by double membrane
-filled with stroma
-contains stacks of thylakoid (grana)
-grana are joined by lamellae
-contains DNA + ribosomes - synthesises proteins in replication + photosynthesis

Question 2

Large permanent vacuoles

Answer 2

-consists of membrane - tonoplast
-filled with cell sap
-keeps cell firm

Question 3

Cell wall

Answer 3

-freely permeable to most substances
-structural support
-made of polysaccharide cellulose
-plasmodesmata - pores within walls
-connect 2 cells together by cytoplasm