Why is the first step of DNA base-pairing so unlikely? Why is forming subsequent base-pairs much more likely?

In DNA-hybridization experiments on six species of plants in the genus Vicia, DNA was isolated from each of the six species, denatured by heating, and sheared into small fragments (W. Y. Chooi. 1971. Genetics 68:213–230). In one experiment, DNA from each species and from E. coli was allowed to renature. The graph shows the results of this renaturation experiment. Q. Notice that, for the Vicia species, the rate of renaturation is much faster in the first hour and then slows down. What might cause this initial rapid renaturation and the subsequent slowdown?

Assuming DNA replicates semi-conservatively, which of these most closely approximates what you would see after one generation if you were to perform the Meselson-Stahl experiment? one band two bands three bands

What is the mechanism by which these designed nucleases cause a change in the genomic DNA sequence?

Why is the first step of DNA base-pairing so unlikely? Why is forming subsequent base-pairsmuch more likely?

Based on one strand of a certain segment of DNA with the sequence below, answer the following question: 3'-ATGGATCCCATC-5' a. Is the formula "genotype + environment=phenotype" accurate?

The following features is(are) the requirement(s) for homologous recombination tooccur:A) Very similar (homologous) DNA sequences are required.B) The site of exchange can be anywhere in the homologous sequences.C) Nucleotide sequences do not alter at the site of exchange.D) Enzymes are required to cut both strands of the double helix.E) All of the above.

If the intact chromosomes of E. coli are labeled with heavy nitrogen (15N), then E. coli is fed light nitrogen (14N), what would be the expected distribution of DNA by the fourth (F4) generation? 12.5% intermediate-weight DNA, and 87.5% light-weight DNA 25% intermediate-weight DNA, and 75% heavy-weight DNA 50% light-weight DNA, and 50% intermediate-weight DNA 75% intermediate-weight DNA, and 25% heavy-weight DNA 87.5% intermediate-weight DNA, and 12.5% heavy-weight DNA The above experiment, on DNA replication in the intact chromosomes of E. coli (with no virus infection) was first carried out by which of the following investigators? Rosalind Franklin and Maurice Wilkins Reiji Okazaki and Tuneko Okazaki Matthew Meselson and Franklin Stahl James Watson and Francis Crick Erwin Chargaff and Arthur Kornberg

Summarize the five modes of action of antimicrobial drugs, withspecific examples of their effects.

In the absence of any other information, which one of the following options is the number of possible reading frames for a region of the DNA double helix? 20 6 3 1