42)
dna differs from rna because dna
a)
contains thymine in place of uracil.
b)
consists of a single rather than a double polynucleotide strand.
c)
contains the sugar ribose rather than the sugar deoxyribose.
d)
contains phosphate groups not found in rna.
e)
is always double-stranded, while rna is never double-stranded.
answer:
a
طيب لييش الجوااب ما يكووون فقرة e
is always double-stranded, while rna is never double-stranded