Question

Giving ‘T’ symbol for true statement and ‘F’ symbol for false statement, select suitable option from the given options for following statements. Cytosine base is the derivative of pyrimidine. ${{\beta }}$-D ribose sugar is present in DNA. The message for the synthesis of a specific protein is present in RNA. DNA is responsible for maintaining the identity of different species of organisms for one century.
A) TFFT
B) FFFT
C) FTFF
D) FFTF

Answer 1

To solve this we must have to verify all the given statements. The given statements are based on DNA and RNA. DNA and RNA are known as nucleic acids. The nucleic acids help in the synthesis of proteins in the body. DNA is used for fingerprinting methods in forensic sciences. RNA is mainly used in protein synthesis.

Complete step-by-step answer:
We will verify each of the given statement as follows:
i) Cytosine base is the derivative of pyrimidine: We know that RNA and DNA are nucleic acids. Nucleic acids contain a five-carbon sugar, a nitrogenous base and one phosphate group. The heterocyclic nitrogenous base in nucleic acids is known as pyrimidine. In DNA, the pyrimidines are cytosine and thymine. In RNA, the pyrimidines are cytosine and uracil.

The structure of cytosine is as follows:

Thus, the statement ‘cytosine base is the derivative of pyrimidine’ is true. Thus, T.

ii) ${{\beta }}$-D ribose sugar is present in DNA: Nucleic acids contain a five-carbon sugar, a nitrogenous base and one phosphate group. If the sugar is a deoxyribose sugar then the nucleic acid is known as deoxy ribonucleic acid or DNA. The deoxy ribose sugar present in DNA is ${{\alpha }}$-D ribose sugar.
Thus, the statement ‘${{\beta }}$-D ribose sugar is present in DNA’ is false. Thus, F.

iii) The message for the synthesis of a specific protein is present in RNA: The synthesis of proteins occurs in two steps: Transcription (genetic instruction is transferred from DNA to mRNA), Translation (genetic code in mRNA is read to make protein). Thus, messages for the synthesis of a specific protein are present in DNA. Thus, the statement ‘the message for the synthesis of a specific protein is present in RNA’ is false. Thus, F.

DNA is responsible for maintaining the identity of different species of organisms for one century: We know that all the organisms inherit the genetic information that specifies their structure and function from their parents. The genetic information is transferred by the genetic material DNA. Thus, DNA maintains the identity of different species.Thus, the statement ‘DNA is responsible for maintaining the identity of different species of organisms for one century’ is true. Thus, T. Thus, the correct answer is TFFT.

Thus, the correct option is (A) TFFT.

Note: The basic building blocks of nucleic acids i.e. DNA and RNA are known as nucleotides. Nucleotides are made up of nucleosides and phosphate. Nucleosides are made up of a nitrogenous base and a five carbon sugar. Nucleotides play an important role in the metabolism.