41-Chemolitotrophs organisms A. oxidize inorganic ions such as nitrate or iron t
ID: 133009 • Letter: 4
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41-Chemolitotrophs organisms A. oxidize inorganic ions such as nitrate or iron to obtain energy B. contain photosynthetic pigments that convert solar energy into chemical energy C. derive their energy needs from organic molecules by fermentation or respiration D. de rive their energy from photosynthesis but their carbon needs from growth on organic molecules 42- The exosporium found in endospores is composed of A. peptidoglycan B. protein C. phospholipids D. none of the above 43-Endospores are commonly produced by bacteria in the genus A. Bacillus B. Clostridium C. Mycobacterium D. Both (A) and (B) 44- Which of the following sentences is/are true about endospores? A. Endospores allow bacteria to survive environmental conditions that are not favorable for growth B. Their resistance is due in part to the fact they have a thick endospore coat C. They are resistant to heat, radiations, acids, and disinfectants D. Endospores represent a dormant stage E. All of the above sentences are true 45- Some bacteria derive energy by oxidative respiration if oxygen is present but are capable of using fermentation in the absence of oxygen. These bacteria are A. facultative anaerobes B. microaerophiles C. aerotolerant organisms D. obligate anaerobes 46-Streptococci belong to the group of C. aerotolerant organisms A. facultative anaerobes B. microaerophiles D. obligate anaerobesExplanation / Answer
41) The correct option is A. oxidize inorganic ions such as nitrate or iron to obtain energy.
Chemolithotrophs organisms oxidize inorganic ions such as nitrate or iron to obtain energy to fix CO2.
42) The correct option is B. protein.
The exosporium is the outermost structure of the spore. It is composed of proteins.
43) The correct option is A. Bacillus.
Bacillus are the most common bacteria, which produce endospores. The endospores of this bacteria are highly toxic to many organisms.
44) The correct option is E. All of the above sentences are true.
An endospore is a dormant, tough and non-reproductive structure. They ensure the survival of a bacterium through periods of environmental stress. They are resistant to heat, radiation, acids, temperature, and chemical disinfectants. They have thick layers of protein form the Spore coat. which helps in resistance.
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