Q.Can you attempt building models of biomolecules using commercially available atomic models (Ball and Stick models).

Yes — building models with commercially available ball-and-stick atomic model kits is a very good way to picture biomolecules in three dimensions, and the study of their structures encourages exactly this.

A few examples worth attempting:

• An amino acid such as alanine — a central alpha-carbon (the central ball) bonded to four groups: an amino group (NH2), a carboxyl group (COOH), a hydrogen, and a methyl (CH3) side chain, showing why it is like a substituted methane.
• Glycerol — a three-carbon chain carrying three hydroxyl groups.
• A sugar such as glucose (C6H12O6) or ribose (C5H10O5).
• A nitrogen base such as adenine, to show its ring (heterocyclic) skeleton. …

Studying biomolecules is largely about working out their structures, and once a structure is known it can be represented physically. A ball-and-stick atomic model kit is well suited to this: each ball represents an atom, and each stick represents a chemical bond joining two atoms. Because a carbon atom has four valency positions, a model kit lets you actually see those four bonds pointing out in three dimensions, which a two-dimensional picture on paper can only hint at.

Good biomolecules to attempt building are the small ones:

• An amino acid, for example alanine. Place a central ball for the alpha-carbon and attach four groups to it: an amino group (NH2), a carboxyl group (COOH), a single hydrogen, and a methyl group (CH3) as the side chain. This makes clear why amino acids are described as substituted methanes — the central carbon simply has its four positions filled by these groups, and only the side chain differs from one amino acid to another.
• Glycerol. Build a short three-carbon chain and attach three hydroxyl groups; this is the trihydroxy propane backbone to which fatty acids attach in fats.
• A sugar. Glucose (C6H12O6) or ribose (C5H10O5) can be assembled to show a carbohydrate. …

Method: Translating an Abstract Formula into a Concrete Model

This question is really asking you to demonstrate that you understand a molecule's structure well enough to build it physically, so the strategy is to first pick molecules whose structure you can state precisely (not vaguely), and then translate that stated structure directly into a ball-and-stick description.

For each candidate molecule, work out how many "balls" (atoms/groups) attach to the central atom and in what arrangement. For an amino acid, recall the substituted-methane picture: one central alpha-carbon with exactly four attachment points (amino group, carboxyl group, hydrogen, and the R group that identifies the specific amino acid) — this immediately tells you how many sticks to use and where they go. For glycerol, it's a three-carbon backbone with three hydroxyl groups attached. For a nitrogen base like adenine, the key structural fact to reproduce is that it i …