Which statements are true about molecules? Select all that apply. A. They are the smallest unit of an element or a compound. B. They are a group of atoms that are strongly joined. C. They always contain only one type of atom. D. They always contain different types of atoms.

Answer

1) Gram Iodine 2) area of clearing or non stained halo

Explanations:

Amylase catalyzes the breakdown of starch into maltose, a disaccharide ( two joined monosaccharide like glucose). This action was the reason why there was zone of clearing since starch molecules has been broken down. If present starch give a blue black colouration with Iodine.