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'.

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.