AP BIOLOGY

THE MOLECULAR BASIS OF INHERITANCE

STRUCTURE OF NUCLEIC ACIDS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
The structure of DNA is ____ because the 2 strands of nucleotides are equidistant from one another and they are oriented in opposite directions.
A
anti-parallel
B
parallel
C
conservative
D
semiconservative
Explanation: 

Detailed explanation-1: -DNA is composed of two strands of nucleotides held together by hydrogen bonding. The strands each run from 5’ to 3’ and run in antiparallel, or opposite, directions from one another.

Detailed explanation-2: -The strands of a DNA double helix are said to be “antiparallel” because the have the same chemical structure, but are opposite in direction.

Detailed explanation-3: -DNA strands are antiparallel because of the presence of hydrogen bond. Hydrogen bond binds the complementary bases (purine and pyrimidine)

Detailed explanation-4: -antiparallel definition. A term used to describe the opposite orientations of the two strands of a DNA double helix; the 5’ end of one strand aligns with the 3’ end of the other strand.

Detailed explanation-5: -Due to the base pairing, the DNA strands are complementary to each other, run in opposite directions, and are called antiparallel strands.

There is 1 question to complete.