2.5- Ultrastructure Of Plant Cells

Question 1

Vacuole and its function?

Answer 1

• vacuoles are membrane lined sacs in the cytoplasm containing cell sap.
• usually very large in plant cells and are very important in the maintenance of turgor so cells remain rigid.
• the membrane of the vacuole is called the tonoplast which is selectively permeable.
• vacuoles in animal cells are small and temporary.

Question 2

cell wall and its function?

Answer 2

-prokaryotic cells have a cell wall made of peptidoglycan. it is a complex polymer formed from amino acids and sugars.

-cellulose cell wall in plant cells.
helps support the cell by keeping it rigid. Acts as a defence mechanism against invading pathogens.

Question 3

chloroplasts and its function?

Answer 3

• the organelles responsible for photosynthesis in plant cells.
• found in the cells of the green parts of plants.
• They have a double membrane. the fluid enclosed in the chloroplast is called the stroma.
• Contain DNA and ribosomes so they are able to make their own proteins.
• the internal membranes provide a large SA needed for the enzymes,proteins and other molecules necessary in photosynthesis.