The ultrastructure of plant cells Flashcards Preview

Biology OCR (2, basic components of a living system) > The ultrastructure of plant cells > Flashcards

Flashcards in The ultrastructure of plant cells Deck (22)
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1
Q

What extra cell components do plants cells have?

A
  • Cell wall
  • Permanent vacuole
  • Chloroplast
2
Q

What are vacuoles?

A

Membrane lined sacs in the cytoplasm containing cell sap.

3
Q

Why do plants have permanent vacuoles?

A

They help to keep the cell turgid, and so that the contents of the cell push against the cell wall and maintain a rigid framework.

4
Q

What is the membrane of a vacuole called?

A

Tonoplast

5
Q

Why is the vacuole selectively permeable?

A

So that some small molecules can pass through it but others cannot.

6
Q

What is the major reaction that happens inside the chloroplast?

A

Photosynthesis

7
Q

Where are chloroplast found in plant cells?

A

Inside the green parts, such as the stems and leaves.

8
Q

Describe the structure of the chloroplast

A

They have a double membrane with fluid inside called the stroma. They have an interior network of membranes, which form flattened sacs called thylakiods. Several of these thlokiods stacked together are called granum (plural grana). The grana are held together by membranes called lamellae

9
Q

What do grana contain?

A

The chlorophyll pigments

10
Q

What happens inside the chlorophyll pigments?

A

Light dependent reactions occur during photosynthesis

11
Q

What is the equation for photosynthesis

A

carbon dioxide + water —> glucose + oxygen + water

12
Q

What is the symbol equation for photosynthesis

A

6CO2 + 6H2O —> C6H12O6 + 6O2

13
Q

Do chloroplast contain DNA and ribosomes?

A

Yes (just like the mitochondria)

14
Q

What are plant cell walls made of?

A

Cellulose (a carbohydrate)

15
Q

The fact that chloroplast contain there own DNA and ribosomes allows them to make what?

A

There own proteins

16
Q

What does the large surface area of the internal membrane in chloroplast provide?

A

Enough surface area for the enzymes, proteins and pigment molecules necessary for the process for photosynthesis.

17
Q

Why are plant cell walls freely permeable?

A

To allow substances to pass in and out of the cell through the cellulose wall.

18
Q

Why do plants have a cell wall?

A

To maintain there rigid shape. And to protect the contents of the cell against invading pathogens.

19
Q

What are the small holes in the cell wall called?

A

Plasmodesmata

20
Q

What do the plasmodesmata allow for?

A

One cell to exchange material with another (via the cytoplasm).

21
Q

Draw and label a plant cell

A