This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Proteins and Amino Acids, Subject name: Biochemistry
[{'content': 'Equal number of nucleotide bases are seen between which pair of nucleotides: \nSelect and explain. \nA. A=G, B. G=T, C. G=C, D. A=C', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. (c) G=CRef: Harper's Biochemistry; 30th ed. pg. 360-361Chargaffs Rules for Double stranded (ds) DNA| |* In all cellular DNAs regardless of species-- Number of adenosine residues is equal to no. of thymidine residues (i.e. A=T).- No. of guanosine residues is equal to no. of cystidine residues (G=C)* From these relationship it follows that sum of purine residues- A+G=T+C- Ratio of purine to pyrimidine is always around 1.T+CA+G =-1 - The base composition of DNA generally varies from one species to another- DNA specimens isolated from different tissues of same species have the same base composition.- The base composition of DNA in a given species does not change with an organism's age, nutritional state or changing environment.", 'role': 'assistant'}]