Recombinant DNA molecules:.a) contain DNA combined from two different organisms b) are made using restriction endonucleases to generate 'sticky ends' or 5' overhangs c) are made using enzymes that recognize sequence palindromes d) need ligase activity during their construction to seal the sugar-phosphate backbone e) all of the above

Because the earth is not round ,but it may seem round when viewed from ,our planet but true some points earth is not round was an oblate spheroid -a square that it squashed as globe however is not even a perfect oblate spheroid.in fact isaac newton's first proposed that earth was not perfectly round but it was an oblate spheroid instead.that mean a square that is squashed as its poles and swollen at the