Which of the following statements is true about escherichia coli? a. e. coli cannot survive in anaerobic conditions. b. e. coli cannot survive in aerobic conditions. c. in anaerobic conditions, it will undergo respiration; in aerobic conditions, it will undergo fermentation. d. in aerobic conditions, it will undergo respiration; in anaerobic conditions, it will undergo fermentation.

Ans.

Escherichia coli is a facultative anaerobic, gram-positive bacterium that can survive in absence or presence of oxygen. When oxygen is available in its surrounding, it shows respiration, in which complete breakdown of glucose takes place to produce energy. However, in the absence of oxygen, it shows fermentation for energy generation.

Hence, the correct answer is 'option d). in aerobic conditions, it will show respiration, and in anaerobic conditions, it will show fermentation.'

the oxygenated blood then leaves the lungs through pulmonary veins, which return it to the left heart, completing the pulmonary cycle. this blood then enters the left atrium, which pumps it through the mitral valve into the left ventricle. from the left ventricle, the blood passes through the aortic valve to the aorta.

deoxygenated blood leaves through the right ventricle through the pulmonary artery. from the right atrium, the blood is pumped through the tricuspid valve (or right atrioventricular valve), into the right ventricle.

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