Question

which of the following best describes how dna and rna are similar?
they both have a double helix
they both contain a and t
they are both composed of 5 different nucleotides
they both have c and g

Explanation:

• DNA has a double - helix structure, while RNA is usually single - stranded. So the option "They both have a double helix" is incorrect.
• DNA contains thymine (T), while RNA contains uracil (U) instead of T. So the option "they both contain A and T" is incorrect.
• DNA is composed of 4 nucleotides (adenine - A, thymine - T, cytosine - C, guanine - G), and RNA is composed of 4 nucleotides (adenine - A, uracil - U, cytosine - C, guanine - G). So the option "They are both composed of 5 different nucleotides" is incorrect.
• Both DNA and RNA contain cytosine (C) and guanine (G).

Answer:

they both have C and G