Which base is present in $RNA$ but not in $DNA$?

What is the unit consisting of a base,sugar,and phosphate in nucleic acids called?

Which of the following represents the simplified version of a nucleoside?

The primary structure of a nucleic acid contains the base sequence $GATGC...$. Which of the following chains is complementary to this sequence?

The segment of $DNA$ which acts as the instructional manual for the synthesis of the protein is

Explain the structure of nucleic acids.