Which of the following are factors that both unicellular and multicellular organisms actively balance in order to achieve homeostasis?
a.) size, shape, and mass
b.) texture, density, and flexibility
c.) wastes, nutrients, and water
d.) sound, light, and temperature

How does the nervous system affect the excretory system?

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.

Availability of food: a. is dependent upon kin selection. b. can be highly variable, depending on season and rainfall. c. is determined by the alpha male only. d. is restricted to individuals in the dominant hierarchy.