Question

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25) Bacteria which grow best at temperature of 50°C are called (1pts) psychrophiles O mesophiles thermophiles microaerophiles 26) Yeast extract is added to a peptone medium primarily to provide additional amounts of O B vitamins O carbohydrates gelatin inorganic salts Opeptidoglycans 27) Facultative anaerobic bacteria (1 pts) respire in the presence or absence of free oxygen reuqire an excess of carbon dioxide for growth Ogrow only in the presence of minute quantities of oxygen are obligate thermophiles 28) Fastidious microorganisms ——. (1 pts) are heterotrophic O require very clean environment have complex nutritional requirements are always anaerobic O All of the above are correct

Answer 1

25) thermophile bacteria

These bacteria grow well and at their maximum potential at 50°C - 80°C.

Mesophiles grow at moderate temperature that is below 46°C

Psychrophiles live in low temperature.

Microaerophiles require low level of oxygen than present in environment.

26) B vitamins. Yeast extract it is a best source for or B vitamins like vitamin B12, B6, Folic acid. Some other things which are present in yeast extract are like some minerals and some amino acids.

27) respire and presence and absence of oxygen both. This bacteria normally loves aerobic conditions but sometimes can also survive without oxygen for sometime. In anaerobic condtions the growth of bacteria is very slow. This is just adaptive strategy.

28) have Complex nutritional requirements. These are some organisms which are very hard to culture in the laboratory conditions because the conditions required for their culture are very hard to maintain in the laboratory environment for much period of time. Therefore these are called as fast radius organisms. They only grow in specific conditions of temperature, nutritional requirement, moisture, humidity, pH etc.

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