Iodine starch- Cell membrane transport

What part of a cell does the "plastic bag" represent?

• cell membrane- enter or leave

• cytoplasm- jelly fluid that fills up cell

• nucleus- where the genetic information is stored

Tags

NGSS.MS-LS1-2

What color was the starch at the start of the experiment? dark or white?

What color was the starch at the end of the experiment? dark or white?

Tags

NGSS.MS-PS1-2

The iodine moved ________________ (Select : in to /out of)

the bag, becuase the starch in the bag turned a purple dark color and the iodine is purple dark color.

Water and starch are bigger molecules that CANNOT cross the cell membrane but (a)   is a smaller molecule that can

• Iodine
• salt
• sugar

The plastic bag is PERMEABLE to iodine because...

• iodine got mixed with water outside since water can escape the plastic bag

• iodine got mix with starch since it is a small molecule

• iodine is a very large molecule that can easily cross the cell membrane

The plastic bag is​ (a)   to starch because the solution in the glass beaker did not turn dark color.

• NOT permeable
• permeable

Match the following

• react changes color to test carb-starch

• During the experiment

• Iodine molecules move from bag

• End of the experiment

• prepare the iodine bag / beaker

• Osmosis

• movement of water from High - Low

• Start of the experiment

• iodine turned dark purple

• Iodine

(a)   is that physical process in which any solvent moves, without input of ENERGY, across a semi-permeable membrane separating tow solutions of different concentrations.

• Diffusion
• Osmosis
• Active Transport

Select other names for cell membrane. Hint select- 3

• plasma membrane

• cytoplasm

• cell wall

• phospholipid bi layer

• semi-permeable membrane