Question

1. Answer the following questions concerning a section of double-stranded DNA containing 1000 base pairs. a. If the DNA contains 28% adenosine residues, how many guanosine residues are in the DNA? b. Are the nucleotide compositions of each of the two individual strands of DNA identical? Explain. c. If the DNA is entirely in the B-DNA conformation: i. How many helical turns does the DNA contain? ii. What is the length of the DNA? 2. Write the sequence of a strand of DNA that is complementary to the strand shown below-specify the 5 and 3' ends. 5-G-A-T-C-C-A-A-G-T-3

Answer 1

to as Civen, A = 281 that, as we know A =T A=T=28% Hence ie. A+T = 28+28 = 56%. C=G=180-56= 44% since, c equal a ..c=a=44 = 22% Hence Cueno sine residue=22%. yes, nucleotide composition of two individuel are always same. lie. it is always made of Nobase + Pentose sugert pol- by ce In B-ONA - IJ DNA no. of Helix twins depends upon its Length Is length of DNA depends upon its no. of bore-pair eigt distance between two mocheo bp=3.4 Å Length of one Helix - 3.4×10 = 34 Å complementary sequence of s-GATCCAGT-3' is- (3-cTAGGTCA-S 2.