How does a model demonstrate the structure of DNA

How does a model demonstrate the structure of DNA

They used Tinkertoy-like models to show that DNA is shaped like a twisted ladder. ... The "steps" of the DNA ladder are pairs of bases: adenine (A) and thymine (T) or cytosine (C) and guanine (G). The order of the base pairs holds the specials code for how living things grow and develop.

Explanation:

Why are models used to represent DNA?

The nucleotides of DNA are arranged into a double helix based on the rules of base complementarity. Scientists build models based on existing data and use their models to explain and make predictions about natural systems. ... Use a model of DNA to explore and describe key features of the molecule.

9.9 years

a = p(1 + rt) . . account balance after time t at rate r starting with principal p

3000 = 2500(1 + 0.0202t) . . filling in the given numbers

1.2 = 1 + 0.0202t . . divide by 2500

0.2 = 0.0202t . . . subtract 1

0.2/0.0202 = t ≈ 9.901

it will take about 9.9 years for the account balance to reach $3000.