6.) Return to the original size screen. Leave this structure on the screm i e. Do Not EXIT. a) Type hbonds off (ENTER); select all (ENTER). by Pick wireframe from the Display menu c) Reorient the molecule to a vertical position-see next page for example, d) Type zoom 100 or desired size (ENTER). Open to full screen. c) This is a double strand of DNA composed of several nucleotide pairs. How many Answer the following questions on the diagram on the next page 1) What subunit(s) or molecular group(s) is/are on the outside of this molecule? Why? Indicate the subunit(s) on the diagram 2) What groups are on the inside of this molecule? Indicate the groups on the diagram. What explanation can you give as to why these groups or molecules are on the inside of the structure? 3) Are the two strands of this double stranded DNA parallel or antiparallel? Label the 3 and 5 ends of each strand. To see how the two straads are wrapped around cach other, select backbone from the Display menu. Then pick chain from the Colors menu. Now pick sticks from the Display menu. 4) Indicate on the diagram the major and minor grooves. 5) In the two previous questions, you were looking at a small section of this molecule. What does something like C9B, G4A tell you about the subunits, their relationship to each other, location in the molecule, and about the molecule in general? ID where the two subunits are located in the molecule on the next page.