The ability of bacteria to tolerate antibiotics and remain unaffected by them. Resistance may evolve naturally in bacteria after years of exposure to antibiotics. It is controlled by genes and can be spread between bacteria. Many medically important bacteria have become resistant to one or more antibiotic drugs. Bacteria that have resistance to many different antibiotics are a major medical worry as they may result in infections that are untreatable.
Bacteria can be beneficial or harmful.
A DNA strand incorporates thousands or millions of these 4 building blocks. The same building blocks are present in all forms of life. Bt Bacillus thuringiensis , a bacterium commonly found in soil. The smallest functional unit of a living organism. Most animals, plants and fungi are made up of many cells.