When orange iodine is exposed to starch it turns blue-black

When orange iodine is exposed to starch it turns blue-black. In an experiment, you placed a cornstarch solution in a small plastic bag. Next, you placed the the bag in a beaker of water containing 10 drops of iodine. If the solution in the plastic bag turned blue-black (Select all that apply)

the plastic bag was selectively permeable.

the cornstarch moved into the beaker.

the iodine moved into the plastic bag.

the plastic bag was permeable to iodine.

the plastic bag was permeable to cornstarch.

Enzymes have which of the following characteristics? (select all that apply)

They are inorganic molecules.

They are used up during the reaction.

They act as catalysts.

The can bind with substrate.

They are all proteins.

2. What may affect the rate of an enzyme-driven reaction? (Check all that apply)

pH

temperature

concentration of enzyme

concentration of substrate

the air pressure

3. Enzyme activity can be determined in the following ways (select all that apply):

by measuring how much of the enzyme is consumed

by measuring how much of the substrate is consumed

by measuring how much of the product is produced

determining when the amount of substrate is equal to the amount of product

by measuring the ratio of enzyme to substrate concentration