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Unit Test II ans key_revised

Unit Test II ans key_revised - Unit Test II Ans key MCQ 1 C...

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Unit Test II Ans key MCQ: 1) C 2) D 3) D 4) C 5) A 6) B 7) D 8) C 9) C 10) D 11) C 12) C 13) C 14) C 15) C 16) A 17) A 18) C 19) B 20) A T/F: 1) T 2) F 3) F 4) T 5) F 6) T 7) F 8) T 9) T 10) F Match A and B: 1) e 2) j 3) h 4) f 5) g 6) i
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7) b 8) c 9) a 10) d SQ: 1) Tm is the temperature required to denature 50% of the DNA. Because G-C base pairs are formed with three hydrogen bonds, it takes more heat to separate them than the A-T pairs. UV absorption increases if DNA is heated and it is called hyperchromic shift. 2) 3) The first level of packing happens when DNA strands wrap tightly around the histone octomer (11 nm diameter fiber) . Numerous nucleosomes coil closely together (six-fold increase in compactness), creating the second level of packing (30 nm diameter fiber) 14 N/ 14 N light DNA Parental heavy DNA 14 N/ 15 N hybrid DNA Conservative model Semiconservative model Dispersive model Parental 1 st generation 2 nd generation 14 N/ 14 N light DNA 14 N/ 15 N hybrid DNA
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The third level of packing occurs just before mitosis. The 30-nm fiber further condenses into 300-nm chromatin fiber. Next, the 300-nm fiber condenses into 700- nm chromatids of metaphase (value varies among organisms).
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