AP BIOLOGY

THE MOLECULAR BASIS OF INHERITANCE

STRUCTURE OF NUCLEIC ACIDS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
What type of bond holds the nitrogenous bases together?
A
peptide bond
B
phosphate bond
C
ionic bond
D
hydrogen bond
Explanation: 

Detailed explanation-1: -Hydrogen bond (H-bond) binds the nitrogen bases between the two strands of DNA. There are two H-bonds between A and T; three H-bonds between G and C.

Detailed explanation-2: -hydrogen. Covalent bonds occur within each linear strand and strongly bond the bases, sugars, and phosphate groups (both within each component and between components).

Detailed explanation-3: -Nitrogenous bases in nucleic acids are held together by hydrogen bonds. Hydrogen bonds occur when hydrogen is covalently bonded to a much more electronegative element such as chlorine or nitrogen.

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