If channels in the outer membrane of a neuron were blocked, what would be the consequence? a. membrane fluidity would be impaired and the neuron would undergo apoptosis . b. osmosis would be disrupted and the neuron would be unable to communicate. c. many chemicals would not be able to move into and out of the neuron, disrupting communication. d. the neuron would be deprived of oxygen and would undergo necrotic death.

Which enzyme is responsible for “unzipping" the dna by breaking the hydrogen bonds between the nucleotides?

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.

The diffrences between complement system and interfernon