The purine ring system is shown below.What is the source of the C-6 atom during de novo biosynthesis of purines? 
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Agricultural Produce
Products that are grown and harvested from farming activities, including crops, fruits, vegetables, and livestock products.
Yield to Maturity
The total expected return on a bond if it is held until the date it matures, accounting for its current market price, par value, coupon interest rate, and time to maturity.
Interest Rates
The percentage of a sum of money charged for its use, typically expressed as an annual percentage rate.
Par Value
The face or nominal value of a bond, stock share, or coupon, as specified by the issuer.
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