2.5 Ultrastructure of plant cells

Question 1

Cellulose cell wall

Answer 1

plant walls are freely permeable= substances can pass into and out of a cell through the wall

–> contents of the cell press against the wall, making it rigid

Question 2

What is a Vacuole?

Answer 2

membrane lined sacs in cytoplasm containing cell sap
–> membrane is known as a tonoplast (selectively permeable)

Question 3

What are chloroplasts

Answer 3

organelles responsible for photosynthesis (found in green parts of plants but never in roots
–> granum contain chlorophyll pigments (where light-dependent reactions occur during photosynthesis)
–> chloroplasts contain DNA (cpDNA) and ribosomes (can perform protein synthesis)

Question 4

Structure inside of a chloroplast?

Answer 4

–> double membrane structure with a fluid enclosed in the chloroplast called stroma
–> contains an internal network of membranes forming flattened sacs called thylakoids
–> several thylakoids stacked together are called granum (pl. grana) & grana are joined together by lamelle

Question 5

What does the grana contain?

Answer 5

-> granum contain chlorophyll pigments (where light-dependent reactions occur during photosynthesis)

Question 6

Do chloroplasts contain DNA

Answer 6

–> chloroplasts contain DNA (cpDNA) and ribosomes (can perform protein synthesis)