MCAT CARS Strategy Course Trial Session - Tuesday at 8PM ET! Reserve Spot

MCAT CARS Strategy Course Trial Session - Tuesday at 8PM ET!
Reserve Spot

MCAT Content / Transcription / Ribozymes Spliceosomes Small Nuclear Ribonucleoproteins Snrnps Small Nuclear Rnas Snrnas

Ribozymes, spliceosomes, small nuclear ribonucleoproteins (snRNPs), small nuclear RNAs (snRNAs)

Topic: Transcription

There are many unique types of RNA in cells involved in transcription that may act on their own or in complexes with proteins.

A ribozyme is a special enzyme formed from RNA (rather than protein) that can catalyze a chemical reaction. Some ribosomal RNAs (rRNAs) are ribozymes that link amino acids together to form a protein.

The spliceosome is a protein-RNA complex that acts as an enzyme during pre-mRNA processing. This complex removes introns from pre-mRNA and joins the remaining exons to produce a mature mRNA molecule. Spliceosomes are made up of many small nuclear ribonucleoproteins (snRNPs), which are complexes of proteins and RNA. Each snRNP is itself a complex of proteins and a special type of RNA found only in the nucleus called small nuclear RNA (snRNA).


Key Points

• Ribozymes are enzymes formed from RNA instead of proteins.

• Spliceosomes are protein-RNA complexes that catalyze the removal of introns and joining of exons in pre-mRNA strands.

• Spliceosomes are composed of many protein-RNA complexes called snRNPs, which are themselves composed of a specific type of RNA known as snRNA.


Key Terms

Ribozyme: An enzyme formed from RNA instead of proteins.

Enzyme: A molecule that catalyzes (or accelerates) a biochemical reaction.

Spliceosome: A protein-RNA complex that acts as an enzyme during pre-mRNA processing to remove introns and join together exons.

Small nuclear ribonucleoproteins (snRNPs): Complexes of protein and RNA that are the building blocks of spliceosomes.

Small nuclear RNAs (snRNAs): Nuclear RNAs that make up the RNA component of snRNPs.



Billing Information
We had trouble validating your card. It's possible your card provider is preventing us from charging the card. Please contact your card provider or customer support.
{{ cardForm.errors.get('number') }}
{{ registerForm.errors.get('zip') }}
{{ registerForm.errors.get('coupon') }}
Tax: {{ taxAmount(selectedPlan) | currency spark.currencySymbol }}

Total Price Including Tax: {{ priceWithTax(selectedPlan) | currency spark.currencySymbol }} / {{ selectedPlan.interval | capitalize }}