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

---

Definitions:

Literature Database

A searchable electronic catalog or index of academic and professional publications, which can include books, journals, research reports, and other documents.

Scholarly Journal

A periodical publication that contains articles, research findings, and reviews in a specific academic field, reviewed by experts before publication.

Literature Search

A comprehensive and systematic exploration of published academic materials on a specific topic.

Testing Phase

A stage in the development process where the functionality, quality, or performance of a product, service, or system is evaluated.