gene regulation lac and trp operon AP BIO

1.     What do figures X and Y in the graphic illustrate? 1p

• Transcription and translation in a eukaryotic cell (figure X) and a prokaryotic cell (figure Y).

• Transcription and translation in a prokaryotic cell (figure X) and a eukaryotic cell (figure Y).

• Transcription in a eukaryotic cell (figure X) and translation in a prokaryotic cell (figure Y).

• Transcription in a prokaryotic cell (figure X) and translation in a eukaryotic cell (figure Y)

Tags

NGSS.HS-LS1-1

1.     Reformat to indicate that answer completes stem: "If glucose is absent but lactose is present, the lac operon will be____________." 1p

• activated

• repressed

• partially activated

• mutated

1.     What would happen if the operator sequence of the lac operon contained a mutation that prevented the repressor protein from binding the operator? 1p

• In the presence of lactose, the lac operon will not be transcribed.

• In the absence of lactose, the lac operon will be transcribed.

• The cAMP-CAP complex will not increase RNA synthesis.

• The RNA polymerase will not bind the promoter.

1.     What would happen if the operator sequence of the trp operon contained a mutation that prevented the repressor protein from binding to the operator? 1p

• In the absence of tryptophan, the genes trpA-E will not be transcribed.

• In the absence of tryptophan, only genes trpE and trpD will be transcribed.

• In the presence of tryptophan, the genes trpA-E will be transcribed.

• In the presence of tryptophan, the trpE gene will not be transcribed.

Tags

NGSS.HS-LS1-1

NGSS.HS-LS3-1

What are epigenetic modifications? 1p

• the addition of reversible changes to histone proteins and DNA

• the removal of nucleosomes from the DNA

• the addition of more nucleosomes to the DNA

• mutation of the DNA sequence

Tags

NGSS.HS-LS3-2

1.     Which of the following statements about epigenetic regulation is false? 1p

• Histone protein charge becomes more positive when acetyl groups are added.

• DNA molecules are modified within CpG islands.

• Methylation of DNA and histones causes nucleosomes to pack tightly together.

• Histone acetylation results in the loose packing of nucleosomes.

1.     The binding of what is required for transcription to start? 1p

• a protein

• DNA polymerase

• RNA polymerase

• a transcription factor

1.     What will result from the binding of a transcription factor to an enhancer region? 1p

• decreased transcription of an adjacent gene

• increased transcription of a distant gene

• alteration of the translation of an adjacent gene

• initiation of the recruitment of RNA polymerase

1.     Which of the following statements describes prokaryotic transcription of the lac operon? 1p

• When lactose and glucose are present in the medium, transcription of the lac operon is induced.

• When lactose is present but glucose is absent, the lac operon is repressed.

• Lactose acts as an inducer of the lac operon when glucose is absent.

• Lactose acts as an inducer of the lac operon when glucose is present.

1.     A mutation within the promoter region can alter gene transcription. Describe how this can happen. 1p

• Mutated promoters decrease the rate of transcription by altering the binding site for the transcription factor.

• Mutated promoters increase the rate of transcription by altering the binding site for the transcription factor.

• Mutated promoters alter the binding site for transcription factors to increase or decrease the rate of transcription.

• Mutated promoters alter the binding site for transcription factors and thereby cease transcription of the adjacent gene.

Tags

NGSS.HS-LS3-2