Four discs, each soaked in a different antibiotic, were placed on the surface of a culture plate that had been innoculated with E. coli bacteria. The diagram below shows the culture plated
after it had been incubated for 48 hours.

Key:
Shaded area
represents E. coll
Clear area represents
absence of E. coli
Antibiotic disc
P= penicillin
E=erythromycin
8 = streptomycin
C=chloramphenicol

Whích antibiotic was most effective in inhibiting the growth of E. coli?
1.penicillin
2.erythromycin
3.streptomycin
4.chloramphenicol

Match the following terms describing electrical events with the correct phases of the cardiac cycle. the ventricular muscle cells depolarize at the start of this phase. during this phase, na+ entry through the funny channels causes the pacemaker potential of sa nodal cells to gradually become less negative until it reaches threshold. the ventricular muscle cells repolarize right before this phase. the cytosolic concentration of calcium in the contractile cells of the ventricle is highest during this phase. a. isovolumetric relaxation b. ventricular ejection c. isovolumetric contraction d. ventricular filling

What are simmilarities and differences between anaerobic respiration in animal and yeast cells? would prefer to get simmilarities as i already got some differences. you!

The ancestors of plants that lived in water had plenty of water for the young. angiosperms are a group of land plants that evolved a reproductive trait for living on land. this trait protect young plants by allowing them to grow only when water is present and the conditions for healthy development are right. what trait most likely young angiosperms in this way?