what is the function of the gene products encoded by the lac promoter? Describe how thr...

what is the function of the gene products encoded by the lac promoter? Describe how thr operon is controlled by the lac repressor protein (LacR)

Expert Solution

These genes are transcribed as a single mRNA, under control of one promoter. Genes in the lac operon specify proteins that help the cell utilize lactose. lacZ encodes an enzyme that splits lactose into monosaccharides (single-unit sugars) that can be fed into glycolysis. enzymes produced are permease, beta galctosidase and transacetylase.

The lac repressor is a protein that represses (inhibits) transcription of the lac operon. It does this by binding to the operator, which partially overlaps with the promoter. When bound, the lac repressor gets in RNA polymerase's way and keeps it from transcribing the operon.

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gladiator answered 2 years ago

2. The -10 core promoter of the lac operon gene has the sequence TATGTT. Describe an...

2. The -10 core promoter of the lac operon gene has the sequence TATGTT. Describe an example of a base substitution mutation which would lead to increase transcription of the gene. Explain whether this mutation would increase or decrease the fitness of the organisms.

Describe how the information encoded in a gene results in the synthesis of a functional protein...

Describe how the information encoded in a gene results in the synthesis of a functional protein in eukaryotes (include an explanation of all the parts of the process). Include in your answer the differences that exist between prokaryotes and eukaryotes and where regulation of gene expression can occur.

Describe how the information encoded in a gene results in the synthesis of a functional protein...

Describe how the information encoded in a gene results in the synthesis of a functional protein in eukaryotes (include an explanation of all the parts of the process). Include in your answer the differences that exist between prokaryotes and eukaryotes and where regulation of gene expression can occur.

Describe the likely effect on gene expression of a mutation in the lac operon: a) that...

Describe the likely effect on gene expression of a mutation in the lac operon: a) that delegate the operator b) that mutates the lacI gene inactivating the repressor c) that the promoter mutates in the -10 region

1.)A.)The lac operon is inducible by the presence of lactose. Loss-of-function mutations in the lacI gene,...

1.)A.)The lac operon is inducible by the presence of lactose. Loss-of-function mutations in the lacI gene, which encodes the lac repressor (pick all that apply): A.)slow down the isomerization of lactose into allolactose B.)decrease the amount of permease activity in the cell in the presence of lactose. C.)prevent loss-of-function lacZ mutations from making the lac operon uninducible D.)are recessive to wild type B.)Mutations that eliminate the lacO operator site (pick all that apply): A.)slow down the isomerization of lactose into...

Explain how gene regulation occurs using the lac operon as an example.

Explain how gene regulation occurs using the lac operon as an example

27. Be able to describe regulation of gene expression in prokaryotes (transcriptional, like the Lac Operon)...

27. Be able to describe regulation of gene expression in prokaryotes (transcriptional, like the Lac Operon) and in eukaryotes (transcriptional and epigenetic regulation).

Briefly explain what will happen to the transcription of a gene, if its core promoter elements...

Briefly explain what will happen to the transcription of a gene, if its core promoter elements (Class II promoter with 3 elements: BRE, TATA and Inr) are moved downstream to the TSS (transcription site)? Explain why eukaryotic cells have general and specific transcription factors?

Part 8 What happens on the promoter of a gene? A. ribosomes bind to initiate translation...

Part 8 What happens on the promoter of a gene? A. ribosomes bind to initiate translation B. transcription complex forms to start transcription C. activators bind to increase transcription D. DNA polymerase binds to start replication Translation begins before transcription ends in; A. human cells B. prokaryotic cells C. all eukaryotic cells D. some eukaryotic cells E. plant cells Gene silencing or activation by chromatin packing or unpacking is an example for; A. extreme DNA damage B. epigenetic regulation C....

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what is the function of the gene products encoded by the lac promoter? Describe how thr...

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2. The -10 core promoter of the lac operon gene has the sequence TATGTT. Describe an...

Describe how the information encoded in a gene results in the synthesis of a functional protein...

Describe how the information encoded in a gene results in the synthesis of a functional protein...

Describe the likely effect on gene expression of a mutation in the lac operon: a) that...

1.)A.)The lac operon is inducible by the presence of lactose. Loss-of-function mutations in the lacI gene,...

Explain how gene regulation occurs using the lac operon as an example.

Explain how gene regulation occurs using the lac operon as an example

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