BIOL 300 Lecture Notes - Lecture 3: Rna Polymerase I, Nuclear Transport, Small Interfering Rna

16 views6 pages

maroontiger65

23 Nov 2017

School

Department

Course

Professor

For unlimited access to Class Notes, a Class+ subscription is required.

Document Summary

Biol 300 / lecture 3 : eukaryotic rna polymerases and formation of the pol ii pre- initiation complex (pic) Moon / monday september 11th, 2017 (fall 2017) The basic state of transcription in prokaryotes is therefore on , and is repressed by repressor proteins when needed. In eukaryotes, there has to be a lot of transformation to occur before genes can be transcribed. Genes in highly condensed regions (heterochromatin) tend not to be expressed. These parts of dna are hidden when part of this condensed complex of chromatin. Genes in more open (euchromatin) are more readily expressed and available for binding of the transcription apparatus to dna. In sum, the context in which the dna is kept is very different in prokaryotes and eukaryotes. In higher eukaryotes, much of the dna is non-coding, both within and between genes (e. i large intergenic regions of introns).

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.

BIOL 300 Lecture Notes - Lecture 3: Rna Polymerase I, Nuclear Transport, Small Interfering Rna

Document Summary

Get access

Related Documents

BIOL 300 Lecture Notes - Lecture 2: Catabolite Activator Protein, Pribnow Box, Transcription Bubble

BIOL 300 Lecture Notes - Transcription Factor Ii D, Rela, Sp1 Transcription Factor

BIOL 300 Lecture Notes - Lecture 8: Lac Repressor, Dna-Binding Domain, Deoxyribonuclease I

Related Questions