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HW 13 - HW13 Sathasivan(49750 This print-out should have 10...

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– HW13 – Sathasivan – (49750) 1 This print-out should have 10 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points The lac regulatory system is important to bacteria because the sugar lactose 1. switches the system off and on whether or not lactose is present. 2. is the most common source of food; regu- latory enzymes are needed all of the time. 3. is only rarely available; producing en- zymes all of the time is costly. correct 4. cannot be made by bacteria unless the genes are turned on. 5. is incorporated into the nucleic acid of the bacteria. Explanation: Recall 002 10.0 points Transcription factors are 1. DNA sequences that regulate transcrip- tion. 2. factors that bind to enhancers. 3. polysaccharides that bind to the tran- scripts. 4. proteins that bind to DNA near the pro- moter sequence. correct 5. RNA sequences that bind to RNA poly- merase. Explanation: 003 10.0 points Heterochromatin 1. contains poly A tails.
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