AP BIOLOGY

THE MOLECULAR BASIS OF INHERITANCE

STRUCTURE OF NUCLEIC ACIDS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Which contains cytosine?
A
DNA
B
RNA
C
Both
Explanation: 

Detailed explanation-1: -RNA contains cytosine and uracil as pyrimidine bases while DNA has cytosine and thymine as pyrimidine bases. Both RNA and DNA have the same purine bases i. e., guanine and adenine.

Detailed explanation-2: -Final answer: Adenine, guanine, and cytosine are common in both DNA as well RNA.

Detailed explanation-3: -c) Cytosine: It is present in both DNA and RNA. It is a pyrimidine and pairs with guanine (purine) by a triple hydrogen bond.

Detailed explanation-4: -Cytosine has a molar mass of 111.10 g/mol and a melting point of 320 to 325 °C. It can occur in nucleic acids, such as DNA and RNA. It may also be found as component of nucleoside (nucleobase + sugar deoxyribose or ribose) and nucleotide (nucleoside with phosphate groups).

Detailed explanation-5: -Under normal circumstances, the nitrogen-containing bases adenine (A) and thymine (T) pair together, and cytosine (C) and guanine (G) pair together. The binding of these base pairs forms the structure of DNA .

There is 1 question to complete.