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.

Appreciate the importance of energy management strategies for sustaining high performance at work.

Understand the components and measurements of Gross Domestic Product (GDP) and how they reflect the economy's performance.

Differentiate between GDP and Net Domestic Product (NDP), and understand the role of depreciation.

Recognize the factors contributing to the underestimation or overestimation of GDP, including the underground economy and non-market transactions.

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Definitions:

Reward Deficiency Syndrome

A theoretical neurological condition posited to predispose individuals to addiction and compulsive behaviors due to deregulation of the reward pathways.

Enlarged Ventricles

A condition where the brain's ventricular system is larger than normal, which can indicate brain atrophy or other disorders.

Somatosensory Cortex

A region of the brain located in the parietal lobe that processes sensory information from various parts of the body, including touch, temperature, and pain.

Parietal Lobes

Regions of the brain located behind the frontal lobes, involved in processing sensory information related to taste, temperature, and touch, as well as spatial orientation and navigation.