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BIOL 112 Study Guide - Midterm Guide: Tata Box, Sigma Factor, Stem-Loop

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School
UBC
Department
Biology
Course
BIOL 112
Professor
Karen Smith

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BIOL 112 Full Course Notes
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BIOL 112 Full Course Notes
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Document Summary

5" tataaa 3" (tata box) - 25 - 35 bases away is the transcription start site which is the first base that actually gets transcribed. There is an enhancer sequence upstream of the prokaryote. The gene has a promoter sequence - this contains the - 35 box and - 10 box. [dna looping: the rna polymerase comes and attaches after recognizing the promoter and everything is brought into close proximity. Stops when the sequence of repeated bases are reached at the terminator. recognizes either one of the boxes and attaches: the rna pol recognizes the sigma factor and attaches itself around the. Sigma factor: rna pol starts moving and once it reached the +1 site, the sigma factor is released and rna pol does it"s job. Initiation factors (proteins) bind to the 5"cap and these recruit the rrna. (these also recruit some other factors that helps brings the trna in. )

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Related Questions

1 DNA sequences found in introns provide [A] amino acid sequence information.

[B] regulatory information.
[C] no known useful information.

[D] structure for the gene.
[E] alternative DNA splicing possibilities.

3. The TATA box is a(n)
[A] sequence close to the promoter region of many genes.
[B] square-shaped sequence.
[C] enhancer consensus sequence.
[D] activator sequence necessary for proper translation.
[E] None of the above

5. Regarding genes and gene expression, which of the following is not a difference between prokaryotes and eukaryotes
[A] Eukaryotic DNA does not contain a TATA box close to the initiation site as does prokaryotic DNA.

[B] In eukaryotes, RNA polymerase requires

'transcription factors'or initiation.

[C] Prokaryotic genes are often grouped together in

operons.

[D] In eukaryotes, the regulation of several genes at once requires common control elements in each of the genes.
[E] There is a diversity of eukaryotic polymerases that is reflected in the diversity of eukaryotic promoters.

10) In eukaryotic cells, a repressor

[A] is made of DNA.
[B] binds to the enhancer region to block transcription. [

C] is located both upstream and downstream from the promoter.
[D] binds to the operator to block RNA polymerase.

[E] binds to a silencer to reduce transcription rates.

Coordinated regulation of genes in eukaryotic cells [A] is the result of positioning the same regulatory sequence in front of each gene.
[B] results from all of those genes being under the control of one promoter.

[C] occurs because related genes all have the same

operons.
[D] occurs because enhancers cause DNA to bend.