If the dispersive model of DNA replication had been correct, Meselson and Stahl would have observed that DNA extracted from bacterial cells following a second round of DNA replication in 14N would have been:.
a. only of hybrid density, and somewhat light than after one round of replication.
b. only of hybrid density, and somewhat heavier than after one round of replication
c. of varying densities, spread throughout the gradient
d. all light density because the DNA molecules would have mostly 14N

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human impact on the environment can be seen in the deterioration of the !

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lunar landing mission. apollo 11 was the first manned mission to land on the moon. the first steps by humans on another planetary body were taken by neil armstrong and buzz aldrin on july 20, 1969. the astronauts also returned to earth the first samples from another planetary body.

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dna fingerprinting is defined as a process that determines the dna characteristics of an individual. these dna characteristics are unique among individuals as their fingerprints, so it is known as dna fingerprinting.

steps of dna fingerprinting includes extraction of dna from sample, amplification of dna, restriction digestion of amplified dna, and then analysis of dna by gel electrophoresis, respectively.

thus, the next step performed by the scientist is 'to cut the amplified dna (obtained by polymerase chain reaction) by restriction enzymes that cleave the dna into fragments and their analysis.'