practical unit 7

Question 1

Explain why certain molecules can freely diffuse across the dialysis tubing “membrane” while some others cannot.

Answer 1

bags have microscopic pores that only certain size molecules can pass through

Question 2

Predict what will happen to the color of the bag and beaker in the following scenarios:
a. Dialysis bag filled with 1% starch placed in a beaker filled with iodine/water.
b. Dialysis bag filled with 1% starch and 1% amylase placed in a beaker filled with iodine/water.

Answer 2

a. solution will turn dark blue, beaker will be orange
b. solution will stay clear, beaker will be orange

Question 3

Identify the product of the following reaction: amylase + starch

Answer 3

maltose

Question 4

animal cell tonicity

Answer 4

iso: circles

hyper: spikey

hypo: fat