Model, DNA Structure, on Board

Quick Answer: The DNA structure model on board is a DNA model mounted on a backing board, showing the double helix with its two sugar-phosphate backbones and the base pairs that join them. It is used in biology classrooms to teach how DNA is built and how complementary base pairing works.

Reading the Double Helix from a Board

DNA is made of two long strands of nucleotides, each nucleotide consisting of a phosphate group, the sugar deoxyribose and one of four bases: adenine, thymine, guanine or cytosine. Sugar and phosphate alternate to form each strand’s backbone, and the bases point inwards, pairing across the helix: adenine with thymine through two hydrogen bonds, guanine with cytosine through three.

The two strands run in opposite directions, one from 5′ to 3′ and the other from 3′ to 5′, an arrangement described as antiparallel. They twist around each other into a right-handed double helix whose surface shows two grooves of unequal width, the major and the minor. A board-mounted model presents these features as a wall or bench display, with colour-coded bases that students can read across the helix like the rungs of a twisted ladder.

The title does not say whether the model is a flat relief or a three-dimensional helix fixed to the board, how many base pairs it shows, or whether labels are printed. For a free-standing helix, see the DNA model on base; the companion RNA model on board allows the two nucleic acids to be compared.

Specifications

Applications

• Teaching DNA structure and complementary base pairing in secondary biology
• Wall display in a genetics or biotechnology teaching lab
• Explaining semi-conservative replication using the two strands
• Revising nucleotide structure before topics on protein synthesis

Care & Handling

• Mount the DNA structure model on board with fixings suited to its weight, or stand it on a secure shelf.
• Dust with a soft brush; small base-pair pieces can loosen if pulled.
• Keep it out of direct sunlight to preserve the colour coding of the bases.

Why Choose LabEquip

Biology departments often choose a board-mounted DNA model because it can stay on display beside the genetics bench. LabEquip offers it as part of its biology lab products range, and questions on size and format can go through the contact page.

Frequently Asked Questions

Which bases pair together in DNA?

Adenine pairs with thymine and guanine pairs with cytosine. Each pair links a two-ring purine to a one-ring pyrimidine, so every rung of the ladder has the same length and the helix keeps an even diameter.

Why is a G-C pair stronger than an A-T pair?

A G-C pair is joined by three hydrogen bonds and an A-T pair by only two. Stretches of DNA rich in G-C pairs therefore need more heat or energy to pull apart.

What does antiparallel mean?

The two strands run in opposite directions. One strand runs from its 5′ end to its 3′ end while its partner runs from 3′ to 5′, which affects how DNA is copied.

What are the major and minor grooves?

The sugars of each base pair are attached on one side of it rather than directly opposite each other, so the twisting backbones leave a wide groove and a narrow groove running round the helix. Proteins that recognise particular sequences mostly contact the bases through the wider major groove.

Why choose a board-mounted DNA model?

It can be hung or stood as a permanent display and is less likely to be knocked over than a tall free-standing helix. It suits classrooms where the model should stay visible throughout a topic.

How is DNA different from RNA?

DNA is usually double-stranded, contains deoxyribose and uses thymine. RNA is usually single-stranded, contains ribose and uses uracil instead of thymine.

Last Updated: September 2026