se I and 10. Both a. True b. False 11. Proofreading is done by DNA polymerases.
ID: 203351 • Letter: S
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se I and 10. Both a. True b. False 11. Proofreading is done by DNA polymerases. a. True b. False 12. DNA replication starts at sites called replication forks. a. True b. False 13. The rate of DNA replication in mammalian cells is tenfold faster than in prokaryotic cells a. True b. False 14. Eukaryotic cells have many different DNA polymerases, one or more of which function primarily in repair of damaged DNA. a. True b. False 15. Eukaryotic RNA polymerase I genes code for a. mRNAs b. tRNAs c. small nuclear RNAs and small cytoplasmic RNAs. d. ribosomal RNAs. 16. The large multi-subunit complex that links the general transcription factors to the gene-specific transcription factors is called c. the operator. d. TBP 17. Enhancers have been found in a. eukaryotic cells. b. prokaryotic cells. c. yeast. d. Both a and b 18. DNA sequences that prevent enhancers from acting on promoters located in adjacent domains are called a. insulators. c. repressors. d. boundaries. 19. DNA methylation patterns and their resulting genetic imprinting are inherited by which of the following a. Enzymes put a methyl group on cytosine residues of newly replicated CpG sequences across from G- methyl-C sequences. b. P is incorporated into DNA during replication only across from a G-methy-C sequence. c. When its gene is activated, a methyl group is added to certain CpG sequences in the promoter region. d. Methylation of genes only located on the X chromosome ©2016 Sinauer Associates. Inc.Explanation / Answer
10. The answer is True.
Both the topoisomerases aalow DNA to releive torsion but their modes of action are different. Topoisomerase I cuts one strand at a time, then relieves the torsion and then re-ligates the DNA and move forward. Whereas, topoisomera II cuts both strands at a time.
11. The answer is True.
DNA polymerase moves on a single strand and adds nucleotides to build the compimentary strand. Once the complete strand is made, it moves in the backward direction and this way any wrongly placed nucleotide (which will be having weak bonding with the template) is detected.
12. The answer is False.
It starts at specific sites known ar Origin of Replication sites.
13. The answer is False.
The structural organization of prokaryotic cells is simpler as compared to mammalian cells. Thus, replication is faster in prokaryotes.
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