Suppose the Experiment of Meselson and Stahl Was Performed on a Sample

question 32

Multiple Choice

Suppose the experiment of Meselson and Stahl was performed on a sample of 8 cells, each containing one copy of its circular double-stranded DNA genome, and that had been growing on normal ¹⁴N medium.You then grew the cells for 3 generations in medium containing ¹⁵N.The outcome would be

• A)8 cells with single-stranded DNA molecules with ¹⁴N, and 24 cells with single-stranded DNA molecules with ¹⁵N.
• B)16 cells with double-stranded DNA molecules with equal amounts of ¹⁴N and ¹⁵N, and 48 cells with double-stranded DNA molecules with ¹⁵N.
• C)8 cells with double-stranded DNA molecules with equal amounts of ¹⁴N and ¹⁵N, and 24 cells with double-stranded DNA molecules with ¹⁵N.
• D)8 cells with double-stranded DNA molecules with equal amounts of ¹⁴N and ¹⁵N, and 32 cells with double-stranded DNA molecules with ¹⁵N.
• E)65 cells with single-stranded DNA molecules with ¹⁵N.

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Definitions:

Comorbidity

The co-occurrence of two or more disorders or medical conditions in the same individual, often complicating diagnosis, treatment, and prognosis.

Equifinality

A basic principle of developmental psychopathology which holds that one symptom can have many causes.

Comorbidity

The simultaneous presence of two or more diseases or medical conditions in a patient.

Developmental Psychopathology

The study of the origin and course of individual patterns of behavioral maladaptation, understanding the complexities of mental health issues from a developmental framework.