The rock pipit and the water pipit are two types of birds found in the United
Kingdom and other areas of Europe. The rock pipit and the water pipit have similar
appearances and their habitat ranges overlap.
Which of the following observations most likely caused scientists to classify the birds as
separate species?
A. The rock pipit is not able to produce fertile offspring with the water pipit.
B. The rock pipit population in the United Kingdom is larger than the water pipit
population.
C. The rock pipit eats insects, fish, and seeds, but the water pipit eats only
insects and larvae.
D. The rock pipit remains in the United Kingdom year-round, but the water pipit
only overwinters there.

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.