Verified Answer :

Answer:

Reading from the bottom the sequence of nitrogenous base is TCGA.

Nitrogenous bases are  molecules containing nitrogen and carbon which are present in DNA or RNA. Nitrogenous bases are of two types namely purines (adenine and guanine) and pyrimidines (cytosine, thymine or uracil). The bases may be attached to the sugar to form nucleosides. The attachment of phosphate to the nucleoside forms nucleotide which is the basic composition of nucleic acids.



Reading from the bottom of the sequence of the nitrogenous base is TCGA.


Further Explanation:

DNA is a complex molecule made up of ribose sugar, nitrogenous bases and phosphate groups attached by glycosidic, phosphoanhydride and hydrogen bonds. It can be a double or single-stranded molecule found in almost all living cells. Genetic information is encoded in the form of nucleotides (base+sugar+phosphate group).


There are four types of bases present in the DNA. These are adenine (A), guanine (G), cytosine (C) and thymine (T). Adenine and guanine are called purines and thymine and cytosine are called pyrimidines. Purines form a bond with pyrimidines such as A pairs with T with two hydrogen bonds and G pairs with C with three hydrogen bonds. James Watson and Francis Crick first described the three-dimensional structure of DNA. The sequences of bases are unique to all individuals. DNA transcribed into RNA that is required for protein formation.


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Answer Details:

Grade: High School

Subject: Biology

Chapter: Molecular Biology


Keywords:

DNA, nucleotide, phosphoanhydride, hydrogen bond, adenine, guanine, thymine, cytosine, purine, RNA, James Watson, Francis Crick.

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