Question

the bases of rna are the same as those of dna with the exception that rna contains

multiple choice

cytosine instead of guanine.

uracil instead of thymine.

uracil instead of adenine.

cysteine instead of cytosine.

Explanation:

DNA has four nitrogenous bases: adenine (A), thymine (T), cytosine (C), and guanine (G). RNA also has four nitrogenous bases. Three of them are the same as in DNA: adenine (A), cytosine (C), and guanine (G). But instead of thymine (T), RNA contains uracil (U).

Answer:

uracil instead of thymine.