Which of the following statement(s) is/are true concerning DNA?
A. DNA is contained only in the nucleus of the cell B. DNA strands are encoded by the sequence of four bases—adenine, guanine, cytosine and uridine C. The basic unit of information of DNA is the intron, a sequence of three bases D. There are an infinite number of possible codons
Dna is contained only in the nucleus of the cell-the genetic blueprint of an organism is carried in the nucleus of every cell, encoded by the sequence of four basesadenine, guanine, cytosine and thymine, which together make up two long chains bound together by hydrogen bonds to form a dna double helix. a gene is a segment of dna that is transcribed into a corresponding rna molecule that either codes for a protein or forms a structural rna molecule. genes are commonly between 10,000 and 100,000 base pairs in length and include, in addition to the coding sequence, flanking regions and intervening sequences, termed introns. introns are removed from the primary rna transcript by a process called splicing. the basic unit of information is the codon, a sequence of three bases or triplet. the four nucleotide bases arranged as triplets lead to 64 possible codons. sixty-one of these code for amino acids and three are termination signals called stop codons.