E Coli Cells Grown on ¹⁵N Medium Are Transferred to ¹⁴N

question 56

Multiple Choice

E. coli cells grown on ¹⁵N medium are transferred to ¹⁴N medium and allowed to grow for two more generations (two rounds of DNA replication) . DNA extracted from these cells is centrifuged. What density distribution of DNA would you expect in this experiment?

• A) one high-density and one low-density band
• B) one intermediate-density band
• C) one high-density and one intermediate-density band
• D) one low-density and one intermediate-density band

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Definitions:

Systematic Extermination

The deliberate and methodical elimination of a particular group of people or animals, often carried out as a policy or strategy.

Genocide

The deliberate and systematic extermination of a national, racial, political, or cultural group.

Internal Colonialism

The economic and political subjugation of the minority group by the dominant group within a nation.

Minority Group

A category of people who experience relative disadvantage as compared to members of a dominant social group, often marked by racial, religious, ethnic, or gender distinctions.