A materials scientist tested two forms of Epsom salt under different conditions to see which would dissolve the fastest. The test information is displayed in this table.

Sample Mass Form Water temperature
A 50 grams ground crystals 30ºC
B 100 grams crystals 20ºC
C 50 grams ground crystals 20ºC
D 100 grams crystals 30ºC

Which sample of Epsom salt would you expect to dissolve the fastest?
A. A
B. B
C. C
D. D

Penicillin is hydrolyzed and thereby rendered inactive by penicillinase (also known as β-lactamase), an enzyme present in some resistant bacteria. the mass of this enzyme in staphylococcus aureus is 29.6 kd. the amount of penicillin hydrolyzed in 1 minute in a 10-ml solution containing 10-9 g of purified penicillinase was measured as a function of the concentration of penicillin. assume that the concentration of penicillin does not change appreciably during the assay. penicillin(μm) amount hydrolyzed(nmol) 1 0.11 3 0.25 5 0.34 10 0.45 30 0.58 50 0.61 (a) plot v0 versus [s] and 1/v0 versus 1/[s] for these data. does penicillinase appear to obey michaelis-menten kinetics? if so, what is the value of km? (b) what is the value of vmax? (c) what is the turnover number of penicillinase under these experimental conditions? assume one active site per enzyme molecule.