Lecture 11

Question 1

Cell wall polysaccharides Contain

Answer 1

Cellulose microfibrils, Hemicelluloses (cross-linking glycans), Pectins

Question 2

Plasma Membrane Creates

Answer 2

Cellulose

Callose

Question 3

Golgi Creates

Answer 3

Hemicelluloses
Pectins
Glycoprotein processing

Question 4

ER Creates

Answer 4

Cell wall proteins Enzymes

Polysaccharide synthases

Question 5

Cellulose is:

Answer 5

b (1-4) glucan

Question 6

Cortical microtubules Purpose

Answer 6

Guide the cellulose forming rosettes

Question 7

Diffuse Cell Growth

Answer 7

(Surface expansion)
Cell wall loosening by expansin proteins,
Exocytosis adds hemicellulose and pectin,
Turgor pressure + new cellulose microfibrils

Question 8

Cellulose microfibrils Purpose

Answer 8

Laid down in the inner surface of the primary cell wall. As the cell absorbs water, its volume increases and the existing microfibrils separate and new ones are formed to help increase cell strength

Question 9

Collenchyma Purpose

Answer 9

Elongated cells with irregularly thickened walls. They provide structural support, particularly in growing shoots and leaves

Question 10

Collenchyma Attributes

Answer 10

Living cells at maturity,
Commonly with unevenly thickened, hydrated primary cell walls,
May retain meristematic activity,
Usually occur in the cortex, under the epidermis or along veins in petioles,
Provide flexible support for growing organs

Question 11

Collenchyma: types

Answer 11

Angular (Thickenings of the cell walls are located in the angles or corners of the cells and there are no intercellular spaces),
Lamellar (Thickenings are in the outer and inner tangential walls)