Question

1. look at the model. then, choose the best answer. dna double helix how could this model be revised to include observations related to chemistry? remove some of the existing dna bases of adenine. indicate that the length of dna is approximate. color code the two different dna strands. add labels showing the hydrogen and covalent bonding.

Explanation:

DNA structure involves chemical - bonding. Hydrogen bonds hold the base - pairs together and covalent bonds are in the sugar - phosphate backbone. Adding labels for these bonds would incorporate chemical observations. Removing adenine bases is a biological modification, indicating length is a measurement aspect, and color - coding strands doesn't add chemical information.

Answer:

Add labels showing the hydrogen and covalent bonding.