Why is DNA synthesis continuous on one strand and discontinuous on the
DNA pol is capable of adding NT 5'-3'. Since strands are anti parallel, the okasaki fragments are synthesized 5'-3' on the lagging strand and replicate discontinuously away from the fork, where they eventually get ligated together after DNApolI removes primers.
What is meant by a primer, and why are primers necessary for DNA
Primers are short segments of RNA synthesized by primase using DNA as template. DNA synthesis occurs at 3' end of primer.
Primers are necessary since DNA can't initiate synthesis without a free 3' OH.
Primers are removed in the final product.
If the four deoxynucleotides showed nonspecific base pairing (A to C, A to G, T
to G, and so on), would the unique information contained in a gene be
maintained through round after round of replication? Explain.
No, it would not because the strict rules of base pairing is what allows for faithful copying mechanism, that keeps information the same.
What would happen if, in the course of replication, the topoisomerases were
unable to reattach the DNA fragments of each strand after unwinding (relaxing)
the DNA molecule?
topoisomerases are enzymes that create and relax supercoils in the replicated DNA. If they were unable to reattach DNA fragments, the chromosome would fall apart and the DNA would end up fragmented.
If thymine makes up 15 percent of the bases in a specific DNA molecule, what
percentage of the bases is cytosine?
(A=T)+(G=C)=100%--therefore 30% of bases are AT, and 70% are GC thus 35% of all bases are C.
If the GC content of a DNA molecule is 48 percent, what are the percentages of