Nucleic acid

I have learned in nucleic acid that there are two types which are deoxyribonucleic acid or DNA and ribonucleic acid or RNA. nucleic acids are also found in viruses and cells. I would explain nucleic acid using pictures and illustrations. I will also explain the different words that can be found in this topic. My teacher uses power point to illustrate to us the nucleic acid. He should have used more drawings because some are not clear to me (ONLY some). Sir is very good at teaching it would have been better if he let us done some critical thinking for challenge.