Animal Part - Lab 6

Question 1

The cell membrane (plasma membrane), is composed of:

Answer 1

A bilayer of phospholipid molecules with a mosaic of proteins molecules embedded or attached to it

Question 2

phospholipids and proteins are necessary for
the semipermeable cell membrane to:

Answer 2

To maintain the integrity of the cell contents
Separate the inside of the cell from the outside environment.
Allow selected substances to pass through it.

Question 3

The effect of heat and alcohol damage of cell
membrane can be tested on either the phospholipids
or proteins components by using:

Answer 3

Beet Root Plant

Question 4

Tonoplast

Answer 4

Contains a water soluble pigment Betacyanin (75%) and anthocyanin (25%)

Question 5

Beet characteristic color

Answer 5

Purple to pink

Question 6

How to Detect The Leaked Pigment?

Answer 6

can be observed qualitatively by eye or measured quantitatively by using the colorimeter.

Question 7

What size to cut the beetroot pieces?

Answer 7

1cm

Question 8

What temperatures did we use to study The Effect of Heat on Release of
Pigments From Beet Plant?

Answer 8

0, 20, 40, 60, 80 (celcius)

Question 9

Percentage of ethyl used to
study the Effect of Organic solvents like alcohol on the
Permeability of Biological Membranes.

Answer 9

0, 10, 30, 50, 70, 90

Question 10

Incubating the pieces of beetroot at increasing
concentrations of alcohol will:

Answer 10

damage and dissolve
the biological membranes lipids and thus it
permeabilize it. (red pigment will leak out of the cell membranes)

Question 11

Incubating the pieces of beetroot at temperatures up to
40 Celsius would:

Answer 11

increases the kinetic energy of the cell membrane. (red pigment will leak out of the cell membranes)