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Closed circulatory system Vertebrates, and a few invertebrates, have a closed circulatory system. Closed circulatory systems have the blood closed at all times within vessels of different size and wall thickness. In this type of system, blood is pumped by a heart through vessels, and does not normally fill body cavities. Open circulatory system The open circulatory system is common to molluscs a..

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Genetic drift, gene flow, and natural selection may sound similar or even confusing to some. All three are mechanisms in the evolutionary process that have to do with alleles and/or gametes, but there are several significant differences. Discussions about genes and natural selection usually include the term allele. An allele is just one version of a gene found at the same place (locus) on a chro..

https://youtu.be/wbAldlbNXm4 접합은 F플라스미드가 한 대장균으로부터 다른 대장균으로 복제 후 옮겨가는 현상 F플라스미드를 가진 대장균과 가지지 않은 대장균 사이에 필리라는 통로가 만들어진 후 이동합니다. F플라스미드가 복제 후 직접 옮겨가는 경우에는 F플라스미드를 받은 세포가 F플라스미드를 그대로 가지고 있게 됩니다. F플라스미드가 게놈 상에 삽입되어 형성된 Hfr(High Frequency Recombination)균주의 경우 F플라스미드와 함께 게놈 DNA까지 옮겨진 후 재조합이 일어납니다. 이 때 재조합된 부분을 제외한 나머지 DNA는 제거되므로 F플라스미드까지 제거 되는 것이 특징입니다.

The immune system is the body’s defense system. It is a carefully and closely coordinated system of specialized cells, each of which plays a specific role in the war against bodily invaders. Let’s take a brief sidetrack and talk a bit about these invaders. Pathogens are disease-causing biological agents that can generally be divided into bacteria, viruses, fungi, and parasites. Bacteria We have ..