Please help Thank you A research project using E coli has come to a halt because
ID: 87040 • Letter: P
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A research project using E coli has come to a halt because DNA replication is blocked. It that the DNA strands are not separating. What enzyme is likely faulty? A. Helicase (DNA B protein) B. Topoisomerase I C. DNA ligase D. One of DNA primases E. DNA polymerase I DNA must be replicated with extremely high fidelity, and maintained free of structural acts in order to propagate a species. Which of the following structural changes in DNA, damage, cannot be repaired? A. Pyrimidine dimers B. Mismatched bases C. Methylation of bases, such as 1-methylguanine or 3-methycytosine D. Uracil or incorporated into DNA E. All of the above can be repaired. DNA may be repaired by removing a mutation and replacing it, so-called excision repair. such of the following mutations can actually be repaired directly by a mechanism requiring A. pyrimidine dimers B. Mismatched bases C. Methylation of bases, such as 1-methyguanine or 3-methycytosine D. Uracil incorporated into DNA E. Depuration A genomic DNA segment may be spontaneously removed and inserted into another location of the same chromosome. What is the name of this process, discovered by Barbara McClintock? A. Conjugation B. Transposition C. SOS response E. Cointegration A DNA segment was isolated and analyzed. It actually contained 3 DNA strands held together by a protein polymer. The polymer appeared to be filamentous but was later found to assist with location of homogeneous DNA sequences. What is the most likely protein serving these roles?Explanation / Answer
Answer
25. option Option A is the right answer because DnaB or helicase is the enzyme that is responsible for the separation of two DNA strand by breaking the hydrogen bonds.
26. option E is the right answer because all type of error that mentioned here can be repaired by various DNA repair mechanism.
27. option E is the right answer because depurination can directly be repaired by base excision repair (BER) machinery of repair system.
28. option B is the right answer because Barbara MacKlintock first discovered the gene and called it jumping gene later it turn out to be transposons.
29. option C is the right answer because Rec A is the protein that binds to single strand DNA and facilitates to the non-base pair complex bind with double strand DNA. Rec A plays a role in homologous recombination.