BIOA01H3 Lecture Notes - Ribonucleotide, Nitrogenous Base, Intron

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4 Dec 2011

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Exon- region of the primary transcript that might be part of the final transcript of. Intron- region of the primary transcript that are never part of the final transcript if there is no mistake. Sometime have a regulatory role in gene expression of other genes. 5" utr 3"utr- doesn"t contain info for translation to make protein. Poly(a)tail- small polymer with nucleotides that have adenine, the tail is created separately. Gets added on enzymatically, cleaves off backend of mmrna(stimulates rna polymerase to get out). Splisosomes: cut out introns, complex structure in rna and protein components. Splicing process: recognizes specific rna sequences bracketing the introns. There are specific left and right boundary sequences. Works processively, first recognizes 5" boundary until it finds 3" boundary. Breaks of phosphodiester bonds holding intron to extron and creates new phosphodiester bonds to link the (now) adjacent exons. Alternative splicing: produces alternative mrna, more than one protein can be made from one gene.

Related Questions

Indicate whether eac is true for gene expression in prokaryotes,eukaryotes or both:

1. After transcription, a 3' poly- A tail and a 5' cap areaddeddto the RNA.

2. Translation of mRNA can begin before transcription iscomplete.

3. RNA polymerase binds to the promoter region to begintranscription

4. RNA polymerase can only add a robonucleotide to the 3' end ofthe growing RNA

5. The mRNA transcript is the exact complement of the gene fromwhich it was copied.

lemonyak277

Indicate whether eac is true for gene expression in prokaryotes,eukaryotes or both:

1. After transcription, a 3' poly- A tail and a 5' cap areaddeddto the RNA.

2. Translation of mRNA can begin before transcription iscomplete.

3. RNA polymerase binds to the promoter region to begintranscription

4. RNA polymerase can only add a robonucleotide to the 3' end ofthe growing RNA

5. The mRNA transcript is the exact complement of the gene fromwhich it was copied.

coralfox406

Which of the following is the best characterization of the reading frame in gene expression?

Question 5 options:

The reading frame of a gene is set by the first three nucleotides in a gene's promoter.

Every gene has three possible reading frames, but all three specify the same protein.

Every gene has three possible reading frames, and thus encodes three different proteins.

The reading frame of a gene is set by the first three nucleotides at the 5' end of the mRNA.

The reading frame of a gene is set by the first AUG codon near the 5' end of the mRNA.

Which of the following is/are NOT involved in initiating transcription in eukaryotes?

Question 9 options:

transcription factors

start codon

promoter

template strand of DNA

RNA polymerase

The chemical piece of DNA monomers that makes one DNA monomer different from another is:

Question 10 options:

	the sugar
	the position of the hydroxyl group on deoxyribose
	the nitrogenous base
	the position of the bond between phosphate and sugar
	the phosphate group

BIOA01H3 Lecture Notes - Ribonucleotide, Nitrogenous Base, Intron

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