Answer : Comparative Effectiveness Research
Explanation:
Kornberg performed the experiment to identify the molecules which could be able to replicate the DNA. He used a bacterial strain and bacteriophage which could infect the bacteria by incorporating its DNA.
He was able to detect an enzyme which cold assemble all the molecules to form a new DNA strand and named the enzyme as DNA polymerase.
This DNA polymerase can replicate biologically active DNA in which biologically active means that a biological active progeny DNA of phage was which is very accurate and is viable is produced by the bacteria using the enzyme DNA polymerase.
Protists are the eukaryotes which are neither plants, animals nor fungi. But they are plant-like, fungi-like and animal-like organisms. It is difficult to classify all the protists in one kingdom Protista because of their numerous diversified traits. There are a few parasites, predators and also producers among the protists. Some have a cell wall, while others have a cell membrane. Mode of locomotion can be flagella, cilia or the pseudopodia. The best example is the <em>Euglena</em> exhibiting both plant and animal like characteristics in having a chloroplast performing photosynthesis and exhibiting locomotion by flagella. These diversified traits made the scientists to reclassify the protists. The kingdoms which arose from protist ancestors include the kingdom animalia, plantae and mycota sharing common characteristic features with their ancestor. Scientists say that we should not look for the earliest ancestors of animals among modern-day protists because, the modern day protists have gone through a process of evolution which makes them different from their early ancestors. The gradual changes during the course of evolution has made them different from their ancestors with respect to their structure, adaptations and also the genetic composition.
