MCAT Style Quiz Question 12.2

Two new microorganisms, labeled X and Y, were isolated from an oil spill during a search for organisms that will degrade petroleum products.  DNA was isolated from each, and the percent adenine was measured.  Assume each organism contains normal double-stranded DNA.

Organism X: 18.7% adenine

Organism Y: 29.9% adenine

a.) What percentage of thymine does organism X have?

b.) What percentage of cytosine does organism Y have?

c.) Which organism will have the higher melting DNA (require a higher temperature to denature)?

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