NURSING ANM AND GNM

NURSING EXAM QUESTIONS

MICROBIOLOGY

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
What kind of bonds hold the DNA molecule together?
A
Phosphate bonds and Hydrogen bonds
B
Dipolar bonds and Hydrogen bonds
C
Hydrogen bonds an Sulfate bonds
D
Covalent bonds and Hydrogen bonds
Explanation: 

Detailed explanation-1: -Covalent bonds occur within each linear strand and strongly bond the bases, sugars, and phosphate groups (both within each component and between components). Hydrogen bonds occur between the two strands and involve a base from one strand with a base from the second in complementary pairing.

Detailed explanation-2: -On average, there are 2–3 hydrogen bonds between protein side-chain OH and phosphate groups per structure of protein-nucleic acid complex. Thus, hydrogen-bond scalar couplings between protein hydroxyl 1H and phosphate 31P nuclei would be useful for structural and dynamic investigations of protein-DNA/RNA complexes.

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