What aspects of chromatin structure can affect the initiation of transcription of genes?
What will be an ideal response?
Ans: Actively transcribed genes are associated with euchromatin in regions that are sensitive to nuclease digestion. This observation can be interpreted as meaning that transcription of a particular gene involves nucleosome repositioning to expose the gene's promoter to transcription factors and RNA polymerase. Modification of histones is also involved; in general, acetylation of histones is associated with gene activation, while deacetylation of histones is associated with gene inactivation.
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Cyanobacteria produce which of the following?
A) hydrogen sulfide gas B) large quantities of ammonia C) oxygen D) sulfuric acid
What is an iPS cell?
A. A cell that has been induced into a earlier stage thus making it pluripotent B. A cell that has been fertilized but the nuclei from the sperm and egg have not yet fused C. An egg with 2 nuclei D. A totipotent cell that is extracted from an embryo
Which meiotic phase is matched with the mitotic phase it most closely represents?
a. anaphase I and anaphase b. anaphase II and anaphase
c. metaphase I and metaphase d. interkinesis and telophase e. metaphase II and prophase
The form of RNA that cuts rRNA molecules is
A) tRNAs. B) pseudogenes. C) snoRNAs. D) microRNAs.