bio

Nucleic acids are assembled in the _____ direction.

--5' to 3'-- 2' to 3' 4' to 5' 5' to 1' 1' to 5'

Which of these is a difference between a DNA and an RNA molecule?

--DNA is double-stranded, whereas RNA is single-stranded.-- DNA contains nitrogenous bases, whereas RNA contains phosphate groups. DNA contains five-carbon sugars, whereas RNA contains six-carbon sugars. DNA is a polymer composed of nucleotides, whereas RNA is a polymer composed of nucleic acids. DNA contains uracil, whereas RNA contains thymine.

Which of these nitrogenous bases is found in DNA but not in RNA?

--thymine-- uracil guanine adenine cytosine

In a nucleotide, the nitrogenous base is attached to the sugar's _____ carbon and the phosphate group is attached to the sugar's _____ carbon.

1' ... 3' --1' ... 5'-- 2' ... 1' 2' ... 3' 1' ... 2'