A teacher modeled part of a DNA molecule using two of these coiled springs. Which part of the DNA was the teacher most likely modeling?

The part of DNA that the teacher was modelling would be the backbone of DNA.

Explanation:

The DNA is made of double helical structure which is twisted. In the structure of DNA two strands are coiled among each other.

The DNA consists of the nitrogenous bases, phosphate groups and deoxy-ribose sugar.

The backbone of DNA is made up of sugar( alternating )and phosphate group.The nitrogenous bases such as adenine, cytosine ,guanine and thymine are joined to the deoxy-ribose sugar.

This backbone part was part that the teacher was making as a model by using two coiled springs.

1. loamy sand is about 80% sand with 10% clay and defined mostly by sand particles with some clay to provide structure and fertility. the sand particles are easily visible and the soil holds structure but breaks apart easily.

2. scott sand can improve his soil quality by incorporating more silt and organic matter into the soil. peat moss and organic matter can also be incorporated.