Alexander Fleming discovered the penicillin in 1928. He noticed that some bacteria he had left in a petri dish had been killed by naturally occurring penicillium mould.The penicillin began the era of antibiotics, has been recognized as one of the greatest advances in therapeutic medicine. The research required to determine if the penicillium extract was safe and killed bacteria was done at Oxford University.P<span>rogram of animal experiments and clinical trials was carried.</span>
A compound of a covaelent or ionic bond
The factors limiting the size of cells include: Surface<span> area to </span>volume<span> ratio (</span>surface area / volume<span>) Nucleo-cytoplasmic ratio. Fragility of cell membrane.</span>
Answer:
Eukaryotes
Explanation:
The protista are not classified under animal, plant or fungus category. They are mostly unicellular but some protists for example, algae are considered as muticellular. The multicellular protists like seaweed provides oxygen, food and shelter for various ecosystems under water. The seaweed is similar to a plant but not categorized under plantae kingdom as it is less complex as compared with plants.
They are generally heterotropic that means they gain energy by consuming other organisms. The protists can also obtain energy by photosynthesis that is heterotropic in nature.
<span>The code for heredity is carried on <u>genes</u> in each organism's DNA.
Genes carry codes for heredity - based on them, the offspring will have (or won't have) some of the characteristics of his or her parents.</span>
