The purine ring system is shown below.What is the source of the carbon atoms 2 and 8 during de novo biosynthesis of purines? 
Definitions:
CCA Rate
Refers to the Capital Cost Allowance rate, which is used in taxation to represent the annual depreciation expense of a physical asset's cost.
NPV
Net Present Value, a financial metric that calculates the difference between the present value of cash inflows and the present value of cash outflows over a period of time.
Salvage Value
The estimated resale value of an asset at the end of its useful life, accounting for depreciation.
Discount Rate
In discounted cash flow analysis, this is the rate used to ascertain the present worth of cash flows expected in the future.
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