mRNA Processing

During mRNA processing _________ regions of genetic code are removed and the mRNA segments combined to form a single processed mRNA strand.

• Intron

• Exon

The specialized enzyme(s) that do the mRNA processing are called the...

• RNA Polymerase

• Spliceosome

• Helicase

• RNA Catalase

For our model...The RNA code, Introns (non-coding regions) will begin with _______ and end with ________.

• CA? , ?TC

• GU? , ?AG

Answer explanation

CA? --> ?TC was the code for DNA introns.

Which of these below is/are mRNA introns (non-coding regions)?

• CAT GGG CCC ATC

• GUA CAA ACC AAG

• GUG AAA UCC ACG

• CAA CCC GAA UAG

• GUG ACC AAU CAG

Answer explanation

Remember mRNA introns must start with GU? and will end with ?AG

How many introns are in the mRNA sequence below?

UAG GCA GUA AAG AAA GUG CCC AAG CCA GUA AAA AGA

• No Introns

• One Intron

• Two Introns

• Three Introns

• Four Introns

Answer explanation

UAG GCA GUA AAG AAA GUG CCC AAG CCA GUA AAA CCA

How many introns are in the mRNA sequence below?

UAG GCA CUA AGU AAA GUG CCC ACG CCA GAA AAA AGA

• No Introns

• One Intron

• Two Introns

• Three Introns

• Four Introns

Answer explanation

UAG GCA CUA AGU AAA GUG CCC ACG CCA GAA AAA AGA, none of the Codons 'end with' ?AG, so not introns even though there is the 'start of one with Sixth Codon.

How many introns are in the mRNA sequence below?

UAG GCA GUA AAG AAA GUG CCC AAG CCA GUA AAG AAC GGA

• No Introns

• One Intron

• Two Introns

• Three Introns

• Four Introns

Answer explanation

UAG GCA GUA AAG AAA GUG CCC AAG CCA GUA AAG AAC GGA

Provide the processed mRNA sequence after introns are removed fro this sequence. No space between bases, one space between codons>

GGA AAG CAA GUA AAG AAC CCC

(a)  

Answer explanation

GGA AAG CAA GUA AAG AAC CCC

Remove the green section combine the two pieces (spliceosome).

Provide the processed mRNA sequence after introns are removed fro this sequence. No space between bases, one space between codons.

GGA GGG CCC UUA GUA AAA CCA UCC AAG UAA

(a)  

Answer explanation

GGA GGG CCC UUA GUA AAA CCA UCC AAG UAA

Remove the green section combine the two pieces (spliceosome).

Provide the processed mRNA sequence after introns are removed fro this sequence. No space between bases, one space between codons.

GUA GGA CAG GGG CCA AAC GUA AAU CAG CCA GGA

(a)  

Answer explanation

GUA GGA CAG GGG CCA AAC GUA AAU CAG CCA GGA

Remove the green section combine the two pieces (spliceosome).