Question

Which of the following is not one of the nitrogen bases that form the rungs of the ladder in DNA? a. adenine 2. cytosine 3. francine, 4. guanine

Answer 1

3. francine

Step-by-step explanation:

thymine (T), adenine (A), cytosine (C), and guanine (G) thymine are the rungs of the DNA ladder.

Answer 2

3 francine

Step-by-step explanation:

The four nitrogenous bases that compose DNA nucleotides are shown in bright colors: adenine (A, green), thymine (T, red), cytosine (C, orange), and guanine (G, blue). francine is not one of them