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27 Cards in this Set

  • Front
  • Back
32) What kind of base pairs does RNA usually form?
Intramolecular base pairs.
33) What is the function of tRNA?
Deliver specific amino acids to ribosomes.
34) What is the function of mRNA?
Express a gene in a protein, read by ribosome, working copy of DNA.
35) What is the function of hnRNA (eukaryotes)?
Pre-cursor to mRNA if it need to be fixed before it becomes mRNA.
36) What is the function of rRNA?
Primarily structural (rRNA + Proteins = Ribosomes).
37) What is the function of snRNA?
Small nuclear RNA’s function is entirely catalytic for spliceosomes, they help process hnRNA into mRNA in eukaryotes
38) hnRNA contains?
Introns and exons, precursor for mRNA.
39) What is RNA editing?
The addition of individual nucleotides in the middle of the mRNA sequence.
40) A) [---------------------------------] ; B) [------------]; which one is hnRNA, and which one is mRNA?
A) is hnRNA, and B) is mRNA.
41) Bacterial RNA polymerase produces?
mRNA, tRNA, & rRNA
42) Eukaryotic RNA polymerase I produces?
rRNA precursor.
43) Eukaryotic RNA polymerase II produces?
mRNA precursor.
44) Eukaryotic RNA polymerase III produces?
tRNA precursor.
45) Mitochondrial RNA polymerase produces?
mRNA, tRNA, & rRNA.
46) What are the subunits of the RNA polymerase holoenzyme?
? Alpha, beta, beta’, sigma (factor).
47) Closed and open complexes are associated with?
Bacterial transcription initiation.
48) What type of sequences aid in the ability of RNA polymerases to recognize the nucleotide at which initiation begins?
49) What type of sequences aid in the ability of enhancing RNA polymerases activity even further, and are also present within the genes?
50) After a few incorporations of a first few nucleotides, do promoters stay with RNA polymerase or do they unbind from the complex?
They unbind away from the complex.
51) 5’ cap tells the cell?
I’m ready.
52) Poly A tail tells the cell?
Do not degrade me.
53) Prokaryotes have operons that enable them to transcribe?
Several genes at once.
54) In eukaryotes you can only transcribe how many genes in a row?
1 (1 gene = 1 polypeptide).
55) DNA binding proteins are also known as?
Transcription factors.
56) Transcription factors do what?
They regulate transcription.
57) Response elements are related to?
Enhancers and silencer sequences.
58) Hormones are able to _________ transcription?