Cell wall & plasma membrane

24. What are the three major functions of the cell wall?

Strength, flexibility, and protection of cell contents.

25. What are cell-wall microfibrils made from?

Cellulose

26. What does the primary cell wall contain?

Cellulose, hemicellulose, pectin, and glycoprotein.

27. What does the secondary cell wall contain?

Cellulose, hemicellulose, and lignin.

28. When is the secondary cell wall deposited?

After the cell has finished growing and is undergoing differentiation.

29. What is the major function of the secondary cell wall?

Provides extra structural support and strength.

30. What is the middle lamella?

Material that binds the primary cell walls of two adjacent cells.

31. What are plasmodesmata?

Strands of cytoplasm extending between adjacent cells through openings in the cell wall.

32. What can plasmodesmata transport?

Sugars, amino acids, ions, and other cellular substances between adjacent cells.

33. What is the basic structure of the plasma membrane?

A phospholipid bilayer.

34. What are some protein functions within the plasma membrane?

Transporters, channels, pumps, and receptors.

35. What is turgor pressure associated with?

The volume of water in the large vacuole.