A solution of Lambda DNA has a concentration of 0.1mg/ ml.  How much DNA (in mg) do we have in a 4 ml sample? 

2. Given that lambda has a genome size of 50 Kb, how many complete lambda genomes are present in the 4 ml volume from Question 1? (1 Kb = 1,000 base pairs; 1 Kb = 1.1 x 10-12 mg)