This is due to the similar electronic configuration (more importantly the number of valence electrons). Among the two groups given here, choice (b) Mg, Sr and Ba are alkaline earth elements (part of group IIA) in the periodic table. Other elements of this group are Be, Ca and Ra. All these elements form the alkaline earth metal group of the periodic table. All these elements have 2 valence electrons, which they can give up to attain a +2 charge as cations. They have certain common properties, including shiny and silver-white appearance.
The backbone of the DNA strand is made from alternating phosphate and sugar residues. The sugar in DNA is 2-deoxyribose, which is a pentose (five-carbon) sugar. The sugars are joined together by phosphate groups that form phosphodiester bonds between the third and fifth carbon atoms of adjacent sugar rings.he backbone of the DNA strand is made from alternating phosphate and sugar residues. The sugar in DNA is 2-deoxyribose, which is a pentose (five-carbon) sugar. The sugars are joined together by phosphate groups that form phosphodiester bonds between the third and fifth carbon atoms of adjacent sugar rings.
DNA polymerase adds nucleotides onto the 3'OH end of the preceding nucleotide and carries out synthesis in the 5' to 3' direction down the length of the DNA. The result of DNA polymerase function is two copies of DNA that contain one original and one newly synthesized strand of DNA.To unlock this lesson you must be a Study.com Member.he result of DNA polymerase function is two copies of DNA that contain one original and one newly synthesized strand of DNA. To unlock this lesson you must be a Study.com Member.