AP BIOLOGY

THE MOLECULAR BASIS OF INHERITANCE

DNA MAKES RNA MAKES PROTEIN

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
All of the following are true about the structure of DNA except
A
DNA is made of short single strands of nucleotides
B
every DNA nucleotide contains a sugar, a phosphate group, and a nitrogenous base.
C
DNA is made of two strands of nucleotides joined by hydrogen bonds.
D
the long strands of nucleotides are twisted into a double helix.
Explanation: 

Detailed explanation-1: -All of the following are true Of DNA EXCEPT; DNA double helix that consists Of two antiparallel strands DNA polymer of nucleotides DNA has sugar-P-sugar-P backbone DNA contains the nitrogenous bases adenine; guanine; thymine and cytosine The two strands of double stranded DNA are held together by covalent bonds.

Detailed explanation-2: -Answer and Explanation: The correct option: The structure which is not true for a DNA molecule is B. Single-stranded.

Detailed explanation-3: -Answer and Explanation: The correct answer: The character which is TRUE about DNA is E. A purine always forms a complementary base pair with a pyrimidine. There is a specific model of DNA structure and in the double-helix structure of DNA, the complementary base pairing of the nitrogenous base is observed.

Detailed explanation-4: -The information in DNA is stored as a code made up of four chemical bases: adenine (A), guanine (G), cytosine (C), and thymine (T). Human DNA consists of about 3 billion bases, and more than 99 percent of those bases are the same in all people.

There is 1 question to complete.