Which of the following is not true of the regulation of translation initiation in eukaryotes?
A. Repressors bind to the 3' untranslated region of mRNA.
B. Repressors bind to initiation factors.
C. Repressors bind to translational start sites of mRNA.
D. Repressors bind to translational release factors.
The function of the bacteriophage N protein is to:
A. bind directly to the promoter of genes that are active late in the infection process.
B. allow transcriptional read-through of hairpin terminator sites in mRNA.
C. block repressor synthesis.
D. block transcription of all phage genes except its own.
Which of the following is not true about histone modification and the enzymes that create them?
A. The enzymes responsible are often part of multiprotein complexes that include transcription factors.
B. The enzymes responsible can work with chromatin remodeling complexes to alter specific regions of chromatin in response to environmental signals.
C. The modifications can be passed on by epigenetic inheritance.
D. The enzymes responsible can create histone variants.
E. All of these choices are correct.
A polylinker is a:
A. synthetic DNA fragment that contains multiple restriction enzyme sites.
B. synthetic DNA fragment inserted into a vector that allows replication of the vector in the host cell.
C. DNA sequence that allows for selection of cells that contain the vector.
D. molecule used to ligate DNA fragments together.
E. synthetic DNA fragment used in colony hybridization to visualize colonies that contain the DNA of interest.
Which of the following reflects sequence elements conserved in pre-mRNA splice sites?
A. CTAG at the 3' end of the 5' exon
B. GAAG at the 3' end of the intron
C. AG at the 5' end of the intron
D. G at the 5' end of the 3' exon
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