The Meselson-Stahl Experiment Used DNA Containing ¹⁴N and ¹⁵N to Show

question 24

Multiple Choice

The Meselson-Stahl experiment used DNA containing ¹⁴N and ¹⁵N to show that DNA replication is semi-conservative. If replication had been conservative (i.e., one double helix formed of 'old' DNA, and one completely new double helix) , what would have been the expected outcome of the experiment after one round of replication?

• A) Half the DNA would have ¹⁴N density and half would have ¹⁵N density.
• B) All the DNA would have¹⁴N density
• C) All the DNA would have¹⁵N density
• D) All the DNA would have density intermediate between¹⁴N and ¹⁵N

Understand Freud's structural model of the human mind.

Comprehend the principles of social cognitive theory.

Recognize the humanistic perspective on self and identity.

Grasp the foundational concepts of learning theories in behavior.

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Definitions:

Environment

The sum of all external conditions and influences affecting the life and development of an organism, which can be natural or man-made.

Preimplantation Genetic Diagnosis

A technique used to identify genetic defects in embryos created through in vitro fertilization (IVF) before pregnancy.

Autosomes

Chromosomes that are not sex chromosomes and are present in pairs in both males and females, making up the majority of the human genome.

Sex Chromosomes

Chromosomes that determine an individual's sex, with females typically having two X chromosomes and males having one X and one Y chromosome.