Eukaryote, any cell or organism that possesses a clearly defined nucleus. The eukaryotic cell has a nuclear membrane that surrounds the nucleus, in which the well-defined chromosomes (bodies containing the hereditary material) are located. Learn more about eukaryotes in this article.
Perishable foods such as fish, meat and bread have a short life span. Other food can be kept for a considerably longer time but decomposes eventually. Enzymes can bring about destruction of polymers in some foods while chemical reactions such as oxidation and rancidity decompose others but the main single cause of food spoilage is invasion by microorganisms such as moulds, yeast and bacteria.
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Microorganisms, such as bacteria, viruses and bacteriophages, act as cloning vectors to transfer specific sequence of gene, into the plasmid of the bacterial cell using restriction enzymes. The purpose of the restriction enzyme is to bind to the inverted palindrome in both chromosomal and vector DNA; thus cleaving the DNA and producing sticky ends. The sticky ends of both DNA are joined.
Bacteria are not only present outside the human body, but they also live inside the body too. This aggregate collection of microorganisms that is present in the human body is termed as Microflora. Bacteria are also present in the gut, and they aid the process of digestion by releasing certain enzymes. They live in a symbiotic relationship with a human. Other roles of microflora are vitamin K.
Microorganisms are small organisms invisible to the naked eye because of their extremely small size. They are grouped into various groups like Bacteria, fungi, algae, protozoa and viruses. Many of these organisms are useful to human and nature while some are harmful and even cause diseases. Type: Useful microorganisms: Harmful microorganisms: Bacteria: Lactobacillus (curd bacteria) Salmonella.
Compilation of long essay questions. Explain the structure of bacterial cell with the aid of a neatly labelled diagram. Also mention the roles of these structures and methods of their detection. Define sterilization. Classify various methods of sterilization with suitable examples. Define disinfection. Classify various methods of disinfection with suitable examples. What are culture media.
Microorganisms that cause illnesses also affect water quality. Bacteria are single-celled organisms that cannot be seen with the human eye except through a microscope. Some kinds of bacteria are the most dangerous microorganisms. They usually get into water supplies when untreated sewage mixes with the water supply. It is not only a matter of human wastes from leaky sewer.