Question

2) Draw the two base-pairs, A-T and G-C, depicting the nitrogen-containing bases attached to the deoxyribose-phosphate backbone of DNA. Include the hydrogen bonding sites. (Hint: Look at Figure 12.7, Chemistry in Context 7h Edition). A-T base-pairing (show the Hydrogen bonding): G-C base-pairing (show the Hydrogen bonding): 101

Answer 1

Answer:-

As we know that there two types nitrogen bases in DNA which are given below:-

(I) - Purines :- Purines included Adenine (A) and Guanine (G).

(II) - Pyrimidines :- Pyrimidines included Cytosine (C) and Thymine (T).

The two strands of DNA is joined by the hydrogen bonds between the Adenine (A) and Guanine (G) and Cytosine (C) and Thymine (T). There are two hydrogen bonds are formed between the Adenine (A) and Thymine (T) which is known as A-T base pairing whereas three hydrogen bonds are formed between the Guanine (G) and Cytosine (C) which is known as G-C base pairing.

A-T base-pairing (Shows hydrogen bords) -o-p=0 cha TH-N | o cu I - H- NO CHN Two hyphrogen bonds Adenine H Deoxyė ribose sugar I blo AST -o-P=0 phosphate group CH2 Deoxyribose sugar & o=P-o- deoxyribase sugar G-C base - pairing (Shows hydrogen bords) deoxyribose sugar -o-p=0 h N-H T --- - - --H-N N O ----H7--H-N- KH H Cutosine O- canine deoxyribose Three hydrogen bends I -o-p=0 KH Vas Q Hz o Phosphate group b/w G & C Deoxyribose 1 CH2 sugar O=P-o- deorymbose suger deoxyribose sugan