2. Of what units are nucleic
acids constituted? What are
the chemical entities that
compose that unit?

Gap-fill exercise

Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!
acids are formed by sequences
of nucleotides.

are constituted by one
molecule of sugar ( in DNA
and in RNA) bound to one
molecule of phosphate and to one
nitrogen-containing base (,
uracil,cytosine or guanine, in RNA, and
adenine, thymine, cytosine and
, in DNA).