Given a question and a context passage, generate the answer having the word or phrase from the context passage. Here, the answer should be a shortest continous span from the passage.
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Question: Context: Did you ever make a secret code? One way to make a code is to represent each letter of the alphabet by a different number. Then you can send a coded message by writing words as strings of digits. This is similar to how information is encoded using an electric current. The voltage of the current is changed rapidly and repeatedly to encode a message, called an electronic signal. There are two different types of electronic signals: analog signals and digital signals. Both are illustrated in Figure 23.20. A digital signal consists of pulses of voltage, created by repeatedly switching the current off and on. This type of signal encodes information as a string of 0s (current off) and 1s (current on). This is called a binary ("two-digit") code. DVDs, for example, encode sounds and pictures as digital signals. An analog signal consists of continuously changing voltage in a circuit. For example, microphones encode sounds as analog signals. Electronic components are the parts used in electronic devices such as computers. The components transmit and change electric current. They are made of materials called semiconductors. A semiconductor is a solid crystalusually consisting mainly of siliconthat can conduct current better than an electric insulator but not as well as an electric conductor. Very small amounts of other elements, such as boron or phosphorus, are added to the silicon so it can conduct current. A semiconductor is illustrated in Figure 23.21. There are two different types of semiconductors: n-type and p-type. An n-type semiconductor consists of silicon and an element such as phosphorus that gives the silicon crystal extra electrons. An n-type semiconductor is like the negative terminal in a chemical cell. A p-type semiconductor consists of silicon and an element such as boron that gives the silicon positively charged holes where electrons are missing. A p-type semiconductor is like the positive terminal in a chemical cell. Electronic components contain many semiconductors. Types of components include diodes, transistors, and inte- grated circuits. Each type is described in Table 23.2. Electronic Component Diode Transistor Integrated Circuit (Microchip) Description A diode consists of a p-type and an n-type semicon- ductor placed side by side. When a diode is connected by leads to a source of voltage, electrons flow from the n-type to the p-type semiconductor. This is the only direction that electrons can flow in a diode. This makes a diode useful for changing alternating current to direct current. A transistor consists of three semiconductors, either p- n-p or n-p-n. Current cant flow through a transistor unless a small amount of current is applied to the center semiconductor (through the base). Then a much larger current can flow through the transistor from end to end (from collector to emitter). This means that a transmitter can be used as a switch, with pulses of a small current turning a larger current on and off. A transistor can also be used to increase the amount of current flowing through a circuit. You can learn more about transistors and how they work at this URL: http An integrated circuitalso called a microchipis a tiny, flat piece of silicon that consists of layers of elec- tronic components such as transistors. An integrated circuit as small as a fingernail can contain millions of electronic components. Current flows extremely rapidly in an integrated circuit because it doesnt have far to travel. You can learn how microprocessors are made at this URL: Many of the devices you commonly use are electronic. Electronic devices include computers, mobile phones, TV remotes, DVD and CD players, game systems, MP3 players, and digital cameras. All of these devices use electric current to encode, analyze, or transmit information. Consider the computer as an example of an electronic device. A computer contains microchips with millions of tiny electronic components. Information is encoded as 0s and 1s and transmitted as electrical pulses. One digit (either 0 or 1) is called a bit, which stands for "binary digit." Each group of eight digits is called a byte. A gigabyte is a billion bytes that 
 Question: tiny flat piece of silicon that contains layers of many electronic components

Answer: integrated circuit


Question: Context: The following are selected contributors' notes for an essay collection. KATY BUTLER, a 2004 finalist for a National Magazine Award, has written for The New Yorker, the New York Times, Mother Jones, Salon, Tricycle, and other magazines. She was born in South Africa and raised in England, and came to the United States with her family at the age of eight. "Everything Is Holy," her essay about nature worship, Buddhism , and ecology, was selected for Best Buddhist Writing 2006. In 2009 she won a literary award from the Elizabeth George Foundation. "What Broke My Father's Heart" was named a "notable narrative" by the Nieman Foundation for Journalism at Harvard, won a first-place award from the Association of Health Care Journalists, and was named one of the 100 Best Magazine Articles of All Time. Butler has taught narrative nonfiction at Nieman Foundation conferences and memoir writing at Esalen Institute. Her current book project is Knocking on Heaven's Door: A Journey Through Old Age and New Medicine to be published in 2013. VICTOR LAVALLE is the author of a collection of stories, Slapboxing with Jesus, and two novels, The Ecstatic and Big Machine, for which he won the Shirley Jackson Award, the American Book Award, and the Ernest J. Gaines Award for Literary Excellence. He is a 2010 Guggenheim Award winner and an assistant professor at Columbia University's School of the Arts. About "Long Distance" he says: "This essay actually came about when I was asked to write about my life after having lost a great deal of weight. And yet, when I sat down to work, all I could do was return to that time when I was much heavier and deeply unhappy. Why? I sure didn't miss those days. And yet, I felt I couldn't write about my present without touching on that past. But, of course, I never reach the true present in the essay. Maybe I still don't know how to talk about a life with greater happiness. " BRIDGET POTTER was born in Brompton-on-Swale, Yorkshire, and came to the United States as a teenager in 1958. She spent the first forty years of her career in television, beginning as a secretary, then as a producer and an executive, including fifteen years as senior vice president of original programming at HBO. In 2007 she earned a BA in cultural anthropology from Columbia University. This year she will complete an MFA in nonfiction, also from Columbia, where she has been an instructor in the University Writing Program. She is currently working on her first book, a memoir / social history of the 1960s, from which her essay "Lucky Girl" is adapted. PATRICIA SMITH is the author of five books of poetry, including Blood Dazzler, chronicling the tragedy of Hurricane Katrina, which was a finalist for the 2008 National Book Award, and Teahouse of the Almighty, a National Poetry Series selection. Her work has appeared in Poetry, The Paris Review, TriQuarterly, and The Best American Poetry 2011. She is a Pushcart Prize winner and a four-time individual champion of the National Poetry Slam, the most successful poet in the competition's history. RESHMA MEMON YAQUB wouldn't even be fit to write a grocery list were it not for her guardian editors. Her stories owe many glorious plot twists to Zain, eleven, and Zach, seven. Ditto their dad (Amer) and grandparents (Ali, Razia, Muhammad, Nasreen). Costars: Sophie, Sana, Yousef, and Maryam. Miss Yaqub lives in Bethesda, Maryland. Her next project is an investigation into the whereabouts of two missing people: Mr. Right and Ms. Memoir Literary Agent. 
 Question: Who is the most successful poet in the competition's history?

Answer: patricia smith.


Question: Context: One of the challenges faced by Mycobacterium tuberculosis (M. tuberculosis) in dormancy is hypoxia. DosR/DevR of M. tuberculosis is a two component dormancy survival response regulator which induces the expression of 48 genes. In this study, we have used DosR regulon proteins of M. tuberculosis H37Rv as the query set and performed a comprehensive homology search against the non-redundant database. Homologs were found in environmental mycobacteria, environmental bacteria and archaebacteria. Analysis of genomic context of DosR regulon revealed that they are distributed as nine blocks in the genome of M. tuberculosis with many transposases and integrases in their vicinity. Further, we classified DosR regulon proteins into eight functional categories. One of the hypothetical proteins Rv1998c could probably be a methylisocitrate lyase or a phosphonomutase. Another hypothetical protein, Rv0572 was found only in mycobacteria. Insights gained in this study can potentially aid in the development of novel therapeutic interventions. 
 Question: How many genes constitute the DosR regulon, controlled by the dormancy survival regulator (DosR) in Mycobacterium tuberculosis?

Answer:
48 genes