Question

DNA molecule contains 4 bases whoes structure are shown below. One of the structure is not correct, identify the incorrect base structure.

• A.

  

• B.

  

• C.

  

• D.

  

Answer 1

The Correct Option is C

Are bases of DNA molecule. As DNA contain four bases, which are adenine, guanine, cytosine and thymine.

Answer 2

A DNA molecule is composed of four different nitrogenous bases: adenine (A), thymine (T), cytosine (C), and guanine (G). Each of these bases has a unique chemical structure that contributes to the double helix formation of DNA. The question asks us to identify the incorrect base structure among the given options. Let us examine each base:

1. Adenine (A): Adenine is a purine base with a double-ring structure.
2. Thymine (T): Thymine is a pyrimidine base and has a single-ring structure.
3. Cytosine (C): Cytosine, also a pyrimidine, has a similar single-ring structure with distinct functional groups.
4. Guanine (G): Guanine is another purine base with a double-ring structure.

The correct base structures of the DNA are well-defined:

• Pyrimidines: Thymine and Cytosine (single-ring structures).
• Purines: Adenine and Guanine (double-ring structures).

By evaluating the structures provided in the options, we can identify the one that does not match the structure of any of these standard bases. The incorrect structure here is option 3, which does not correspond to the correct chemical structure of any standard DNA bases.

In conclusion, the incorrect base structure in the question is the one depicted in option 3. Make sure to remember key characteristics of purines and pyrimidines while evaluating such diagrams in exams.