Did the earth always have enough oxygen to support aerobic respiration? In your answer describe the important organism(s) involved in the evolution of photosynthesis. Why were these/this organism important to forming today's current environment. Use the following websites to support your answer. You must cite the websites posted below and any other sources that you use to answer the post using APA 7 rules. Articles to read:

https://evolution. berkeley. edu/evolibrary/news/170503_cyanobac teria (Links to an external site.)

https://www. scientificamerican. com/article/timeline-of-photosynthe sis-on-earth/

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.