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Answers:There are 5 commonly-occurring bases: Adenine, Cytosine, and Guanine are found in both DNA and RNA. Thymine is found only in DNA, and Uracil only in RNA. Note that there *are* many other kinds of nucleotide bases, which perform functions in tRNA and rRNA, such as structural functions in tRNA loops. These do not perform any coding function, however.
Answers:There are base PAIRS in DNA--so there have to be an even number (rules out c). Your textbook lists the names of the nucleotides--count them.
Answers:because the arrangement of these bases is what maters most....they are called genes...3 base pairs coded together make a gene and there are thousands of possibilities for these genes
Answers:In double stranded DNA, there are always an equal number of Adenine (A) and Thymine (T) since they form pairs. Likewise there will always be an equal number of Cytosine(C) and Guanine(G). The total AT and CG pairs always add up to 100%. Since there is 15% A, there must be 15% T. Since there is 60% left, there is 30% G and 30% C. Now since you have 1cm of DNA, and the average base pair takes up 3.4 Angstroms (3.4 10^-8 centimeters). 1cm/(3.4 10^-8 centimeters/base pair)*2 bases/base pair = 58823529.4 base pairs. 30% of this is 17647058.8 Cytosines, or 1.76*10^7 Cytosines (If my math is right!)