A. regulating protein levels at the level of translation. B. forming complexes w

ID: 257617 • Letter: A

Question

A. regulating protein levels at the level of translation.

B. forming complexes with the DNA to repress operons.

C. being charged with amino acids and aiding protein synthesis.

D. forming part of the ribosome.

2. Genes for which of the following functions would be constitutively expressed in a bacterial cell such as E. coli?

A. nitrogen limitation

B. osmotic stress

C. heat shock

D. DNA replication

E. virulence

A. transcription of the sRNA is not needed, thus saving nucleotides.

B. they cannot damage the DNA, being made of nucleotides as well.

C. sRNA is not specific, so many proteins can be downregulated at once.

D. translation of the sRNA is not needed, thus saving amino acids.

A. glucose metabolism is critical to the cell’s survival so the resulting proteins are always needed.

B. the regulatory system simply never evolved.

C. lactose costs too much energy to cross the membrane to have the genes on all the time.

D. lactose is very rarely found in the environment.

A. a corepressor protein.

B. a repressor protein to remove it from the DNA.

C. directly to a consensus sequence on DNA.

D. an activator protein to remove it from the DNA.

6. What is the location of the attenuator region that controls the expression of the trp operon?

A. It overlaps the CRP-cAMP binding site.

B. It is between the transcription start site and first structural gene.

C. It is part of the holorepressor.

D. It is located upstream of the promoter.

E. It overlaps the promoter.

These answers are to the best of my knowledge:

1) B. forming complexes with the DNA to repress operons.

2) D. DNA replication

3) D. translation of the sRNA is not needed, thus saving amino acids.

4) C. lactose costs too much energy to cross the membrane to have the genes on all the time.

5) B. a repressor protein to remove it from the DNA.

6)It is between the transcription start site and first structural gene.

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