For a Science Fair Project, Two Students Decided to Repeat

question 33

Multiple Choice

For a science fair project, two students decided to repeat the Hershey and Chase experiment, with modifications. They decided to label the nitrogen of the DNA, rather than the phosphate. They reasoned that each nucleotide has only one phosphate and two to five nitrogens. Thus, labeling the nitrogens would provide a stronger signal than labeling the phosphates. Why won't this experiment work?

• A) There is no radioactive isotope of nitrogen.
• B) Radioactive nitrogen has a half-life of 100,000 years, and the material would be too dangerous for too long.
• C) Avery et al. have already concluded that this experiment showed inconclusive results.
• D) Although there are more nitrogens in a nucleotide, labeled phosphates actually have 16 extra neutrons; therefore, they are more radioactive.
• E) Amino acids (and thus proteins) also have nitrogen atoms; thus, the radioactivity would not distinguish between DNA and proteins.

Recognize the implications and historical context of laws affecting marriage, including anti-miscegenation laws and endogamy.

Describe the sociological significance of proximity (propinquity) in the formation of relationships.

Analyze the role and impacts of cohabitation in contemporary relationships.

Identify the dynamics and challenges of the "second shift" experienced by working mothers.

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Definitions:

Universally Shared Attitude

A perspective or belief held in common across diverse cultures or societies.

Nation's Pride

The collective feeling of pride and allegiance that citizens have towards their country.

Myth

A traditional story, often involving supernatural beings or events, that serves to explain natural phenomena or cultural practices.

Women

Adult female humans, often discussed in various contexts including social, political, economic, and cultural dimensions.