01. which arm of tRNA can act as a binding site for ribosomes? 02. Cellular DNA is considered much more stable than the RNA because of:
-anti-parallel nature
-Presence of thymine than uracil
-Extensive repair mechanisms
-none of the above
03. Topoisomerases can break and ligate two broken DNA strands:
-true
-false
04. Renaturation of DNA will result in:
-Hypochromic effect
-Hyperchromic effect
-both
-none
05.A non –coding regulatory DNA sequence that is bound by a regulatory protein can be:
-promoter
-structural genes
-operator
-all
06.In addition to complimentary pairing plays an important role in selection of correct bases:
-Base stacking interactions
-Hydrogen bonding
-Base pair geometry
-none
07.The lagging strand of DNA is copied in short pieces because:
-d. DNA polymerase can synthesize only in one direction
-to decrease mutation rates
-limited space
-to make proof reading easier