EVERYDAY SCIENCE

Detailed explanation-1: -Bacteria that require oxygen to grow are called obligate aerobic bacteria. In most cases, these bacteria require oxygen to grow because their methods of energy production and respiration depend on the transfer of electrons to oxygen, which is the final electron acceptor in the electron transport reaction.

Detailed explanation-2: -Obligate aerobes survive and grow with oxygen. Obligate anaerobes cannot survive in an oxygen-containing environment; the presence of oxygen leads to cell death. Facultative anaerobes can toggle between aerobic metabolism can switch to anaerobic metabolism.

Detailed explanation-3: -These microaerophiles are bacteria that require a minimum level of oxygen for growth, about 1%–10%, well below the 21% found in the atmosphere. Examples of obligate aerobes are Mycobacterium tuberculosis, the causative agent of tuberculosis and Micrococcus luteus, a gram-positive bacterium that colonizes the skin.

Detailed explanation-4: -An obligate aerobe is an organism that requires oxygen to grow. Through cellular respiration, these organisms use oxygen to metabolise substances, like sugars or fats, to obtain energy.

Detailed explanation-5: -Obligate anaerobes, which live only in the absence of oxygen, do not possess the defenses that make aerobic life possible and therefore cannot survive in air. The excited singlet oxygen molecule is very reactive. Therefore, superoxide must be removed for the cells to survive in the presence of oxygen.