Tag Archives: DAT

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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Cytotoxic T-cells

Which of the following is the chemical released by activated cytotoxic T-cells to fight a viral infection?

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Human Respiratory Rate

The human respiratory rate is regulated by chemoreceptors that monitor which of the following?

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Bocce Ball

There are 5 white, 7 red and 8 black balls in a box. If you are blindly picking up balls from the box, what is the minimum number of balls you need to take out of the box to ensure that you have at least 2 balls of the same color?

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Reaction of Alkenes

Which one of the following reactions of alkenes does the Anti-Markovnikov’s rule apply instead of Markovnikov’s rule?

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Administering Nitrous Oxide

One of the tanks that a pediatric dentist uses to administer nitrous oxide is “empty”, meaning that the N2O inside is at the same temperature and pressure as the room. The ML-6 type cylinder has an internal volume of 165 liters. How many moles of nitrous oxide remain in the empty tank (Ideal gas constant = 0.082 L atm/K mol; assume the apparatus is at sea level; the ambient temperature is 22° C)?

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Photo attributed to Jurvetson.

Special Fungi

Which of the following is a specialized type of fungi that lives on the roots of many vascular plants and enables nutrient absorption?

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