all completely green sequence
  • Which of the following choices represent mRNA molecules that could be produced from the primary RNA transcript by alternative RNA splicing? (In each choice, the yellow part on the left represents the 5' cap, and the yellow part on the right represents the poly-A tail.)Select all that apply.
  • Which statements about the modification of chromatin structure in eukaryotes are true?
  • Which statements about the regulation of transcription initiation in these genes are true?
  • Regulation of a hypothetical operonDrag the labels onto the diagram to identify the small molecules and the states of the regulatory proteins. Not all labels will be used.
Acetylation of histone tails is a reversible process.DNA is not transcribed when chromatin is packaged tightly in a condensed form.Some forms of chromatin modification can be passed on to future generations of cells.Methylation of histone tails in chromatin can promote condensation of the chromatin.Acetylation of histone tails in chromatin allows access to DNA for transcription.
  • Which of the following choices represent mRNA molecules that could be produced from the primary RNA transcript by alternative RNA splicing? (In each choice, the yellow part on the left represents the 5' cap, and the yellow part on the right represents the poly-A tail.)Select all that apply.
  • Which statements about the modification of chromatin structure in eukaryotes are true?
  • Regulation of model operonsThe trp and lac operons are regulated in various ways. How do bacteria regulate transcription of these operons?
  • Which statements about the regulation of transcription initiation in these genes are true?
operon is not transcribedlac operon: lactose absenttrp operon: tryptophan presentoperon is transcribed, but not sped up through positive controllac operon: lactose present, glucose presenttrp operon: tryptophan absentoperon is transcribed quickly through positive controllac operon: lactose present, glucose absent
  • Regulation of model operonsThe trp and lac operons are regulated in various ways. How do bacteria regulate transcription of these operons?
  • Regulation of a hypothetical operonDrag the labels onto the diagram to identify the small molecules and the states of the regulatory proteins. Not all labels will be used.
  • Which statements about the modification of chromatin structure in eukaryotes are true?
  • Which statements about the regulation of transcription initiation in these genes are true?
A(n) operonis a stretch of DNA consisting of an operator, a promoter, and genes for a related set of proteins, usually making up an entire metabolic pathway.Thegenes of an operonis/are arranged sequentially after the promoter.A(n) promoter is a specific nucleotide sequence in DNA that binds RNA polymerase, positioning it to start transcribing RNA at the appropriate place.A(n) regulatory genecodes for a protein, such as a repressor, that controls the transcription of another gene or group of genes.Regulatory proteins bind to the operatorto control expression of the operon.A(n) repressoris a protein that inhibits gene transcription. In prokaryotes, this protein binds to the DNA in or near the promoter.A(n) inducer is a specific small molecule that binds to a bacterial regulatory protein and changes its shape so that it cannot bind to an operator, thus switching an operon on.
  • Operon vocabulary Can you match terms related to operons to their definitions?Drag the terms on the left to the appropriate blanks on the right to complete the sentences.
  • Regulation of a hypothetical operonDrag the labels onto the diagram to identify the small molecules and the states of the regulatory proteins. Not all labels will be used.
  • Which statements about the regulation of transcription initiation in these genes are true?
  • Regulation of model operonsThe trp and lac operons are regulated in various ways. How do bacteria regulate transcription of these operons?
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