AP BIOLOGY

THE MOLECULAR BASIS OF INHERITANCE

DNA MAKES RNA MAKES PROTEIN

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Base pairs in a DNA strand are held together by what type of bonds?
A
covalent
B
hydrogen
C
ionic
D
James
Explanation: 

Detailed explanation-1: -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-2: -Double hydrogen bonds are located in between adenine and thymine. Triple hydrogen bonds are located in between guanine and cytosine. These hydrogen bonding specificities ensure that one strand’s whole base sequence is complementary to the other strand’s base sequence.

Detailed explanation-3: -Within a molecule of DNA, pairs of bases are chemically bonded together by hydrogen bonds. These bonds hold the two strands of the molecule together.

Detailed explanation-4: -DNA is made up of two strands of sugar molecules and phosphate groups, with nitrogen bases in between them that are held together by hydrogen bonds.

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