Central Dogma, Triplet Code and Wobble Pairing
Understanding Genetics: The Central Dogma
In the next few videos, we will be discussing the genetic code. In this video, we will talk about
the central dogma, the triplet code, and wobble pairing.
Ribosomes are responsible for translating mRNA into proteins. To ensure redundancy in the
genetic code, there have to be multiple codons that code for the same amino acid.
Wobble Pairing
The basis for redundancy is the concept of wobble pairing. Multiple codons can code for several
amino acids. For some amino acids, two codons are used.
The codon and anticodon must complement each other, but the third base pair in the codon is
flexible. It means that it can bind to more than one base pair.
In the third codon, cytosine, uracil, and adenine can all bind to inosine. Inosine is a modified
nitrogenous base that occurs in tRNAs.
Mutations
Paris and France are great places to visit! If you're interested in learning more about amino
acids, here are some key things to keep in mind:
● They are the building blocks of proteins
● There are 20 common amino acids
● Each amino acid has a unique side chain
, Types of RNA and Mechanism of Transcription
Types of RNA
RNA can be transcribed from DNA in several forms:
● Messenger RNA
● Transfer RNA
● Ribosomal RNA
● Catalytic RNA
The main difference between transcription and DNA replication is the use of one main enzyme,
RNA polymerase.
Once RNA polymerase binds, it needs to unwind DNA in order to use it as a template to create
RNA. The RNA polymerase enzyme binds to the template strand and creates the RNA molecule.
Unlike DNA polymerases, RNA polymerases do not have proofreading activity. The enzyme is
error-prone and any mistakes can result in translated proteins that may not be functional.
The one exception is that DNA contains thymine and RNA contains uracil.
Eukaryotic mRNA Processing; Spliceosome
MedSchoolCoach MCAT Prep
Eukaryotic mRNA processing involves the modification of the initial RNA molecule synthesized
by RNA polymerase, resulting in the formation of mature mRNA. RNA splicing is the process of
removing noncoding introns. Alternatively, splicing enables the production of multiple protein
products from a single gene. The spliceosome, consisting of RNA-protein complexes called
small nuclear ribonucleoproteins (snRNPs), binds to pre-mRNA and performs the splicing
process.
Understanding Genetics: The Central Dogma
In the next few videos, we will be discussing the genetic code. In this video, we will talk about
the central dogma, the triplet code, and wobble pairing.
Ribosomes are responsible for translating mRNA into proteins. To ensure redundancy in the
genetic code, there have to be multiple codons that code for the same amino acid.
Wobble Pairing
The basis for redundancy is the concept of wobble pairing. Multiple codons can code for several
amino acids. For some amino acids, two codons are used.
The codon and anticodon must complement each other, but the third base pair in the codon is
flexible. It means that it can bind to more than one base pair.
In the third codon, cytosine, uracil, and adenine can all bind to inosine. Inosine is a modified
nitrogenous base that occurs in tRNAs.
Mutations
Paris and France are great places to visit! If you're interested in learning more about amino
acids, here are some key things to keep in mind:
● They are the building blocks of proteins
● There are 20 common amino acids
● Each amino acid has a unique side chain
, Types of RNA and Mechanism of Transcription
Types of RNA
RNA can be transcribed from DNA in several forms:
● Messenger RNA
● Transfer RNA
● Ribosomal RNA
● Catalytic RNA
The main difference between transcription and DNA replication is the use of one main enzyme,
RNA polymerase.
Once RNA polymerase binds, it needs to unwind DNA in order to use it as a template to create
RNA. The RNA polymerase enzyme binds to the template strand and creates the RNA molecule.
Unlike DNA polymerases, RNA polymerases do not have proofreading activity. The enzyme is
error-prone and any mistakes can result in translated proteins that may not be functional.
The one exception is that DNA contains thymine and RNA contains uracil.
Eukaryotic mRNA Processing; Spliceosome
MedSchoolCoach MCAT Prep
Eukaryotic mRNA processing involves the modification of the initial RNA molecule synthesized
by RNA polymerase, resulting in the formation of mature mRNA. RNA splicing is the process of
removing noncoding introns. Alternatively, splicing enables the production of multiple protein
products from a single gene. The spliceosome, consisting of RNA-protein complexes called
small nuclear ribonucleoproteins (snRNPs), binds to pre-mRNA and performs the splicing
process.
