Arna differs from dna in all except which of the following ways?

a. the presence of uracil
b. the 5'-3' orientation of the polynucleotide strand
c. the sugar molecule
d. the number of different functions performed

B. the 5'-3' orientation of the polynucleotide strand .

The complimentary pairing of DNA molecules ensures 5' 3' and 3'[ 5 '  arrangement for correct pairing of purines and pyrimidine (Adenine E with thymine and cytosine with guanine) in opposite direction.  .

RNA only contains five prime and three prime only, but DNA contains both 5'3' and  3'5'.

b brown mice / white sand dunes