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IMG_0004 - 17 Mo was the first person to describe living...

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Unformatted text preview: 17. Mo was the first person to describe living single cells? A) Leeuwenhoek D)Sl . EWirchm 18. Which of the following is a®ot the Cell Theory? 1) All organisms are composed of one or re cells. / 2) The cell is the structural unit of life. ‘ 3) Cells can arise only by division from a preexisting cell.vi‘/ 4) Cells divide only by fission. A)1 <// B)2 C)3 D)4 ‘EN,2and3 19. What is the name of the enzyme that cleaves QSRNA into the small, double— stranded fra ment wn as small—‘ 9 rin RNAs siRNAs)? A) riboendonuclease “B)Dicer ribonuclease B C) deoxyribonuclease D) RNA helicase E) reverse transcriptase 20. H bonds individually are verymwe‘ak and yet the strands of a DNA double W.” helix canWébparated only by very high temperatures approaching 100°C. How does the weakness of H bonds account for such a strong interaction? (/ A) H bond strength decreases with the distance it covers 0/ Blgl bond strength increases with the distance it covers. W bond strength is additive and the many H bonds holding the strands together make it stable. ,. » D) Four H bonds is enough to enhance the strength of the interactions of the two DNA strands. fTHboud strength is proportional to the molecular weights of the interacting molecules. ...
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