Lets Study Basics of Molecular Inheritance:

Difference between RNA and DNA

1. 2’ oh group in aldopentose
2. U instead of T
3. Most RNAs carry out their functions as single strands
4. Structurally and functionally more diverse suited to a diverse array of cellular functions
5. Rna is unique in the sense that its the only molecule to have a role in storage and transmission of information and in catalysis(catalytic RNAs called ribozymes)

Three major kinds of RNAs are produced

1. Messenger RNA
2. Transfer RNA
3. Ribosomal RNA

NOTE:- Additional specific RNA molecules have regulatory or catalytic functions or are precursors of the three main classes of RNAs. RNA molecules can be substrates of RNA molecules.

Diff between replication and transcription:-

1. During replication, the entire chromosome is replicated. In transcription, only some of the DNA segments are transcribed marked by specific regulatory sequences.
2. Primers are required in replication but not in transcription.
3. RNA Polymerase used in place of DNA polymerase.

Similarities between R and T

1. The fundamental chemical mechanism is the same.
2. Polarity is the same.
3. And it uses a template.
4. Like replication, transcription has initiation, elongation and termination.