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What is free on the 3' end of a DNA strand?
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- Suppose one were provided with an actively dividing culture of E. coli bacteria to which radioactive thymine had been added. What would happen if a cell replicated once in the presence of this radioactive base?a.One of the daughter cells, but not the other, would have radioactive DNAb.Neither of the two daughter cells would be radioactivec.All four bases of the DNA would be radioactived.Radioactive thymine would pair with nonradioactive guaninee.DNA in both daughter cells would be radioactive
- Which enzyme addsRNA nucleotides oneat a time when mRNAis copied from DNA?
- ribosomal rna - makes up bulk of RNA in a cell- a large molecule made up of thousands of nucleotides - folds into unique 3D conformation made up of many hairpin loops as a result of comp base pairing within rRNA molecule - rRNA binds with ribosomal proteins to form large + small ribosomal subunits during translation, ribosomal subunits assemble to form the ribosome - part of rRNA forms an enzyme known as peptidyl transferase (ribozymes), catalyses the formation of peptide bonds between amino acids during translation - rRNA helps to align mRNA in ribosome so anticodons of incoming aminoacyl-trna molecules can complementary base pair with mRNA codons - rRNA orientates aminoacl-trna in correct position within ribosomal binding sites (APE)