Meselson and Stahl's Experiments Involved Growing E

question 47

Multiple Choice

Meselson and Stahl's experiments involved growing E.coli on a medium containing 15N (heavy nitrogen) which increased the density of the bacterial DNA.Cells were then grown on a medium containing only 14N.DNA samples were obtained for analysis after one,two and three rounds of replication (generations) and centrifuged on a density gradient.The double-helical DNA forms bands in the gradient depending on its density.How many bands did Meselson and Stahl see after two generation of cells were grown on the 14N medium?

• A)One with DNA containing both 15N and 14N.
• B)Two,one with DNA containing only 15N and one with DNA containing only 14N.
• C)Two,one with DNA containing both 15N and 14N and one with DNA containing only 14N.
• D)Three,one with DNA containing only 15N,one with DNA containing both 15N and 14N and one with DNA containing only 14N.

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Definitions:

Early Majority

A category in the diffusion of innovation theory describing individuals who adopt new products or ideas after the innovators and early adopters, representing a larger segment of the population.

Innovators

Individuals who are the first to adopt new products, services, or ideas, often helping to spread them to the wider population.

Late Majority

Late Majority consists of individuals who adopt new products or innovations after the average member of a society, typically displaying skepticism and waiting until the majority has tested the innovation.

Diffusion Of Innovation

A theory that seeks to explain how, why, and at what rate new ideas and technology spread through cultures.