Question

Select all the differences between DNA and RNA.

A.
In DNA, guanine is replaced by uracil.

B.
RNA contains one strand of nucleotides, and DNA has two.

C.
DNA is contained only within the nucleus and RNA is not.

D.
DNA contains two strands of nucleotides, and RNA has four.

E.
In RNA, thymine is replaced by uracil.

F.
RNA is more complex than is DNA because of its multiple forms.

Answer 1

B, E, F

- B: True — DNA is typically double-stranded; RNA is usually single-stranded.
- E: True — RNA uses uracil in place of thymine.
- F: True in the functional/structural sense — RNA exists in multiple forms (mRNA, tRNA, rRNA, snRNA, etc.) and can fold into diverse structures, giving it greater functional complexity than DNA.

Why the others are incorrect:
- A is wrong — uracil replaces thymine in RNA, not guanine in DNA.
- C is wrong — DNA is not only in the nucleus (also in mitochondria/chloroplasts in eukaryotes and in the cytoplasm of prokaryotes); RNA is found in both nucleus and cytoplasm.
- D is wrong — RNA does not have four strands; DNA is double-stranded and RNA is usually single-stranded (there are four different nucleotide bases, but that’s not what the statement claims).