Tag Archives: DAT

Intelligent Doodles

A friend of yours draws a circle circumscribing a regular octagon. What is the ratio of the area of the octagon to the circle?

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Zero Dipole Moment

Which conformation of 1,2-dichloroethane has a zero dipole moment?

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The Forces Responsible

The forces responsible for the relatively high melting point and boiling point of water, H2O, are:

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Cell Functions

Glycosylation, sulfation and phosphorylation (of proteins) represent functions of which cell organelle?

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Population Growth

Which of the following would be best to use for population growth with known upper limit?

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3-methyl-2-butanol

Which of the following compounds gives 3-methyl-2-butanol upon reduction with LiAlH4?

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Exchange Genetic Information

During what stage of meiosis do homologous chromosomes exchange genetic information?

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Effectiveness of Hand Wash

Bacteria such as V. cholerae are known to follow an exponential growth curve rate, and will double their number every 15 minutes. Fortunately, anti-bacterial hand wash can kill 99.9% of bacteria on a surface. If a colony of 500 V. cholerae cells are left alone for 2 hours, then anti-bacterial handwash is applied thoroughly, how many bacterial cells are left?

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Switch Hitter

Consider the molecule below. If the CH3- and Cl- groups were switched with each other, how would you describe this new molecule relative to the one below?

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Synthesis of Hormones

A researcher is interested in studying the synthesis of peptide and steroid hormones. She harvests 5 samples of cells from different hormone-producing organs of the body and allows each sample of cells (Cell Types 1-5) to synthesize its hormones for a period of time. Afterwards, she measures the intracellular concentration of the hormones synthesized in each Cell Type. The results are displayed in the corresponding chart. Based on the information provided, where would Cell Type 2 possibly be found in the human body?

HormoneChart.png

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