Question
A spiral staircase like the one shown can be a model of the structure of a DNA molecule.
Spiral staircase
In this model, what do the steps on the staircase represent?
A.
A series of amino acids
B.
Pairs of sugar parts
C.
A series of phosphate parts
D.
Pairs of nitrogen bases
Spiral staircase
In this model, what do the steps on the staircase represent?
A.
A series of amino acids
B.
Pairs of sugar parts
C.
A series of phosphate parts
D.
Pairs of nitrogen bases
Answers
GPT-4o mini
In the model of a DNA molecule represented by a spiral staircase, the steps on the staircase represent:
**D. Pairs of nitrogen bases.**
In DNA, the "steps" are formed by pairs of nitrogenous bases (adenine with thymine, and cytosine with guanine) that are connected by hydrogen bonds, while the "rails" of the staircase are made up of the sugar and phosphate backbone.
**D. Pairs of nitrogen bases.**
In DNA, the "steps" are formed by pairs of nitrogenous bases (adenine with thymine, and cytosine with guanine) that are connected by hydrogen bonds, while the "rails" of the staircase are made up of the sugar and phosphate backbone.