How many hydrogen bond accepting pairs of electrons does the molecule of penicillin (shown below) contain? 
Definitions:
Renal Pyramids
Cone-shaped tissues in the kidneys that produce and channel urine towards the ureters.
Renal Medulla
The innermost part of the kidney that contains the nephrons responsible for urine concentration.
Renal Papillae
The apexes of the renal pyramids of the kidney, which release urine into the minor calyx.
Collecting Duct
A network of tubules and ducts in the kidneys that plays a role in the concentration and transportation of urine.
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