2.5 - Ultrastructure of plant cells Flashcards Preview

OCR A Biology A Level - Chapter 2 > 2.5 - Ultrastructure of plant cells > Flashcards

Flashcards in 2.5 - Ultrastructure of plant cells Deck (5)
Loading flashcards...
1

Give the features of the cell wall.

  • Made of cellulose
  • Freely permeable
  • Cell contents press against cell wall giving turgor pressure

2

List the  specialist organelles present in plant cells.

Vacuole

Chloroplasts

3

Give the features of the vacuole.

  • Membrane (called tonoplast) lined sac
  • Contains cell sap Permanent within plant cells (transient (temporary) in animal cells).
  • Tonoplast is selectively permeable.

4

Give the features of chlorplast

  • Responsible for photosynthesis
  • Found in green parts of plants (leaves, stem not roots)
  • Double membrane (like in mitochondria)
  • Chloroplasts manufacture their own proteins as they have DNA and ribosomes

5

What is the structure of a chloropolast?

Internal membrane network - flattened sacs called thylakoids - Several stacked thylakoids make up a granum. - Grana contains chlorophyll (site of photosynthesis) - Starch grains float in stroma (fluid inside chloroplast) - Starch produced by photosynthesis exists in starch grains - Internal chloroplast membrane has large SA, needed for enzymes proteins & pigment molecules for phootosynthesis.