1. What first prompted James Watson's desire to solve the structure of DNA? 2. Why were Watson and Crick considered both an unlikely pair and perfect team to solve the structure
of DNA?

3. Who were the other researchers "racing" to find the structure of DNA?

4. How did Rosalind Franklin's data help Watson and Crick with their research?

5. When did Watson and Crick receive the Nobel Prize and why were there only three recipients?

List the path of the respiratory system

Element before carbon on the periodic table

Select the correct value for the indicated bond angle in each of the compounds. o−o−oo−o−o angle of o3 90° 109.5° < 109.5° 120° < 120° 180° f−b−ff−b−f angle of bf3 180° < 109.5° < 120° 120° 109.5° 90° f−o−ff−o−f angle of of2 < 120° 120° 90° 109.5° 180° < 109.5° cl−be−clcl−be−cl angle of becl2 90° 109.5° 180° 120° < 109.5° < 120° f−p−ff−p−f angle of pf3 90° 109.5° < 109.5° 180° 120° < 120° h−c−hh−c−h angle of ch4 90° < 109.5° 180° 120° < 120° 109.5°