Which nitrogen base is present in mrna and trna but that is not found in dna

Ribose is the sugar found in RNA instead of deoxyribose like DNA. Uracil is the nitrogenous base found in RNA that bonds with adenine instead of thymine that is found in DNA. Like thymine, uracil forms two hydrogen bonds with adenine.

Hope this helps!!!XD

Cytosine, thymine and uracil are pyrmidines (contains a six membered ring of carbon and nitrogen). Cytosine is found in both DNA and RNA, but thymine is only found in DNA and URACIL is only found in RNA. Uracil is the Base found only in RNA.Like thymine, uracil forms two hydrogen bonds with adenine.

yes

explanation:

the index of refraction of the second medium is higher. i just took the test trust me !