Figure 1. Four different bonds (W, X, Y, and Z) in a DNA molecule

Figure 1 represents a segment of DNA. Radiation can damage the nucleotides in a DNA molecule. To repair some types of damage, a single nucleotide can be removed from a DNA molecule and replaced with an undamaged nucleotide. Which of the four labeled bonds in Figure 1 could be broken to remove and replace the cytosine nucleotide without affecting the biological information coded in the DNA molecule?

A. Bond X only

B. Bond W only

C. Bonds Y and Z at the same time

D. Bonds W and Z at the same time

Transcribed Image Text:

5' Nucleotide 3' +H || || Hydrogen Bonds Model 1 3' 5' Adenine Thymine or Uracil C G A CC G D A T T T G CC T G A A Model 2 Guanine Cytosine XXXXX Model 3 W. 3' A G T == T с A Z 5' 5' Nucleotide 3' +H || || Hydrogen Bonds Model 1 3' 5' Adenine Thymine or Uracil C G A CC G D A T T T G CC T G A A Model 2 Guanine Cytosine XXXXX Model 3 W. 3' A G T == T с A Z 5'