All of the following are examples of post-transcriptional regulation except
A) cells can regulate translation by affecting how readily ribosomes associate with mRNA to read it.
B) in eukaryotic cells, small noncoding RNAs that work in post-transcriptional regulation include microRNAs and short interfering RNAs.
C) cells can regulate translation by methylating certain DNA nucleotides.
D) in prokaryotic cells, small noncoding RNAs that work in post-transcriptional regulation include small RNAs.
E) cells can regulate how mRNA is spliced and exported out of the nucleus before translation occurs.
Answer: C
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Which of the following is consistent with the out-of-Africa hypothesis?
A) Modern Homo sapiens can trace their origin back to Neanderthals. B) Modern Homo sapiens can trace their origin back to Homo erectus. C) Interbreeding between early hominin species in Europe and Asia lead to the distinctive features of modern Homo sapiens. D) Homo sapiens have a common ancestor with Neanderthal and Homo erectus from Africa but did not interbreed with them. E) Modern Homo sapiens and Neanderthals have no common ancestor more recent than the first mammals.
The contacts between the DNA and the histones of the nucleosome are:
A. mainly between the R groups of the histones and the phosphate backbone of the DNA. B. mainly between the conserved histone folds and the bases that are exposed in the major groove of the DNA. C. mainly between the conserved histone folds and the bases that are exposed in the minor groove of the DNA. D. more prevalent in regions of the DNA that have tracts of G?C base pairs. E. primarily between the DNA and the histone peptide backbone.
You are working in a lab that studies tobacco mosaic virus (TMV). You wish to perform follow up experiments to the Fraenkel-Conrat/Singer experiments
You use the Holmes ribgrass (HR) strain of TMV that they used, which produces streaks along the veins and contains histidine and methionine in the TMV capsid protein. You also use a second TMV strain that you've isolated, called Purp, that causes purple lesions on the leaves, and lacks histidine and methionine in the TMV capsid protein. If you use Purp RNA and HR proteins to create reconstituted viruses, what lesions do you expect will form, and what will the amino acid composition of the capsid protein be? A. Purple lesions, histidine and methionine in the capsid protein B. Purple lesions, no histidine and methionine in the capsid protein C. Streaks on the veins, no histidine and methionine in the capsid protein D. Streaks on the veins, histidine and methionine in the capsid protein
Which two hepatitis viruses are generally acquired in a similar manner?
A) HBA and HBC B) HBV and HBC C) HBA and HBV