Question

dna double helix
0.34 nm
1 nm
3.4 nm
thymine
adenine
guanine
cytosine
what is the limitation of this model?
colors identifying different parts of the dna structure
the overall shape of dna as being helical in nature
types of dna building blocks (adenine, guanine, etc.) used
the exact length of a dna strand found in humans

Explanation:

A DNA model can show general features like shape (helical), types of nucleotides (adenine, guanine etc.), and use colors to distinguish parts. But the exact length of a human DNA strand is extremely long (about 2 - 3 meters per cell when uncoiled) and highly variable between different cells and individuals. A simple model like this can't represent the exact length.

Answer:

the exact length of a DNA strand found in humans