Molecular Biology-מעבדה רפואית
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(USMLoid) The Trp operon repressor involved in tryptophan biosynthesis in prokaryotes binds to which of the following sequences?
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(USMLoid) Which of the following binds to specific DNA sequences immediately upstream of the start of transcription.
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You have generated an E. coli that contains two copies of the Lac operon. One copy is I-P+O+Z-Y+A+ . The other copy is I+P+O-Z+Y+A+. ( + indicates a wild type copy and - indicates a null-mutant, non-functional copy.) You grow these bacteria on petri plates containing only lactose as a carbon source and on petri plates containing both glucose and lactose as carbon sources. Both plates contain X-gal, which turns blue in the presence of active ß- galactosidase. Which of the following describes the growth of the bacteria
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Shown here are the promoter regions for two genes - Boris (Brs) and Natasha (Nts). Transcription begins at the arrow. Boxes A - G indicate the locations of identified protein-binding sequences. Which of the following is most likely true.
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This image shows the 5' end of the trp operon transcript. The numbered shaded areas are copies of homologous sequences with their orientations indicated by the arrowed ends. Under conditions of no tryptophan, which regions will base-pair with each other?
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To prevent spurious transcription from a gene, acetylation of histones—which is carried out by histone acetyl transferases ahead of a moving RNA polymerase II—is quickly reversed by histone deacetylases and histone methyl transferases in the wake of the polymerase, leaving a trail of specific methylated histones. Which of these curves best represents the distribution of this specific histone methylation mark with respect to the gene shown?
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This schema shows the activation of transcription of a eukaryotic gene (gene X). Indicate what component (A to D) in the drawing corresponds to each of the following. ( ) Mediator ( ) cis-Regulatory sequence ( ) A general transcription factor ( ) DNA not affecting promoter activity Answer with a four-letter string composed of only the letters A to D, e.g. ADBC.
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Which of the following epigenetic factors can most frequently pass from one generation of animal to the next generation.
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The Swi/SNF complex of proteins increases the mobility of nucleosome cores in chromatin. This activity is most likely to
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