The molecules that link together to form starch are glucose molecules.

Here's why:

* Starch is a complex carbohydrate, meaning it's a large molecule made up of smaller sugar units.

* Glucose is a simple sugar, the basic building block of many carbohydrates.

* Amylose and amylopectin are the two main types of starch. Both are made of long chains of glucose molecules linked together.

* Amylose is a straight chain, while amylopectin is branched.

So, starch is essentially a polymer of glucose molecules.