What types of genes are transcribed by RNA polymerase I? What is the structure of the promoter of such genes?
What will be an ideal response?
Ans: RNA polymerase I transcribes ribosomal RNA. The promoter of these genes has two regions. The first region is the core promoter, which extends from -45 to +20 base pairs surrounding the transcription startpoint. The core promoter is generally G-C rich except for an A-T rich region called Inr surrounding the start point. The second region is the upstream promoter element (UPE), a G-C rich region that extends from -180 to -107 base pairs upstream from the transcription start point.
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The portion of the DNA molecule that is ultimately translated is composed of
a. introns. b. anticodons. c. exons. d. transcriptions. e. regulatory proteins.
In order for transcription to be initiated
A. DNA polymerase must have access to the RNA and must also be capable of binding to the gene's promoter. B. RNA ligase must have access to the DNA double helix and must also be capable of binding to the gene's promoter. C. DNA polymerase must have access to the DNA double helix and must also be capable of binding to the gene's promoter. D. RNA polymerase must have access to the DNA double helix and must also be capable of binding to the gene's promoter. E. RNA polymerase must have access to the DNA double helix and also must be capable of binding to the gene's operator.
The notion that organisms have hierarchical levels of structure refers to their
A patient at a clinic complains of diarrhea that is occasionally bloody and has persisted for several days. A microscopic examination of a stool sample reveals the presence of very round cysts. These signs are consistent with infection by
A) Entamoeba histolytica. B) Enterobius vermicularis. C) Balantidium coli. D) Giardia intestinalis. E) Trypanosoma cruzi.