Here's a breakdown of the smaller parts that make up proteins, starch, and DNA:

Proteins:

* Amino Acids: Proteins are made up of long chains of amino acids. There are 20 different amino acids commonly found in proteins. Each amino acid has a central carbon atom bonded to:

* An amino group (-NH2)

* A carboxyl group (-COOH)

* A hydrogen atom (-H)

* A side chain (R-group) that varies depending on the amino acid.

Starch:

* Glucose: Starch is a polysaccharide, meaning it's a complex carbohydrate made up of many sugar molecules linked together. The primary sugar molecule in starch is glucose. Glucose is a simple sugar with the chemical formula C6H12O6.

DNA:

* Nucleotides: DNA is made up of long chains of nucleotides. Each nucleotide consists of:

* A sugar molecule (deoxyribose)

* A phosphate group

* A nitrogenous base. There are four types of nitrogenous bases in DNA:

* Adenine (A)

* Thymine (T)

* Guanine (G)

* Cytosine (C)

Key points:

* Proteins: The sequence of amino acids in a protein determines its specific shape and function.

* Starch: Starch is a major energy storage molecule in plants.

* DNA: DNA carries the genetic instructions for the development and functioning of living organisms.

Let me know if you want more details about any of these molecules!