Biology 1002B Lecture Notes - Lecture 14: Helix-Turn-Helix, Tata-Binding Protein, Leucine Zipper

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31 Mar 2016

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Regulaion trna base pairs with o o o. Mutaion that leads to glucose having no efect on level of operon transcripion? o o o. So it no longer binds with camp, so it no longer binds to dna. During transcripion the polymerase uses complimentary base pairing with. Dna to know which base to add to the trna. Amino acids cannot base pair with anything laci-: consituive expression lacz-: never expressed. Lac operon expression is increased in presence of lactose. Be able to deduce where mutants likely are based on phenotype. Be able to predict phenotype of various mutants. Operon is under negaive control by dna binding protein. Repressor binds operator, makes loop in dna, prevening transcripion. Operon under posiive control by dna binding protein. Cap binding protein bends the helix, makes promoter more atracive o o o o o o o o o o expression.

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.

Biology 1002B Lecture Notes - Lecture 14: Helix-Turn-Helix, Tata-Binding Protein, Leucine Zipper

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