bio answers to pratice final

bio answers to pratice final - 1. D. The rate and direction...

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1. D. The rate and direction of DNA synthesis is the same for the leading/lagging strands, so A and B are wrong. Both require DNA separation so C is wrong. Statement E doesn’t make sense. DNApolymerase uses the structre of the helix to choose the right bases (look back at the lectures on DNA structure). When syntehsis just startes there are not enough bases to make a helix 2. C. The centrifugal of the CsCl, coupled with diffusion result in the formation of a gradient. 3. E. Control of the operon is at two points – initiation of transcription (whether or not it is started) and attenuation (whether or not it continues). 4. A. This protein binds the autoinducer. 5. B. The cell is still capable of repression but not capable of attenuation because it won’t make a 3 – 4 loop. 6. C. In order to revert, a template is needed. A deletion mutation would remove sequences from the template. 7. D. If the error occurs during transcription, only the proteins that are made by translating it may be affected (depending on the nucleotide, where it is etc, there may not be any change). The cell will also be transcribing this gene quite regularly (since the cell has lots of ribosomes), so other copies of rRNA may not be mutated. 8. E. You might think that the mRNA was transcribed from an operon, and each gene in the operon would have its own ribosome binding site. 9. B. (you have to write things out with this question) 10. C. (you have to write things out with this question) 11. A. 12. E. All of the above could change the reading frame and and result in the formation of a stop codon, which resulted in a truncated protein. 13. B. If the CG ratios are different, it means that the DNA sequence is different. In order for homologous recombination to occur after DNA enters a competent cell, the DNA sequences have of the donor DNA and recipient DNA need to be nearly identical. 14. A. 15. C. Transducing phages have accidentally packaged a piece of bacterial DNA instead of a copy of the phage genome. The key here is that the "transducing particle" contains bacterial DNA not phage DNA 16. D. The RE would recognize sequences in the donor DNA and cleave the DNA into smaller fragments. 17.
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bio answers to pratice final - 1. D. The rate and direction...

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