Microbial Nutrition
Biology ⇒ Microorganisms and Microbiology
Microbial Nutrition starts at 9 and continues till grade 12.
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A scientist is studying a bacterium that grows only in the presence of organic carbon sources and cannot use light or inorganic compounds for energy. What is the nutritional classification of this bacterium?
Define the term 'chemolithoautotroph'.
Describe the difference between simple diffusion and facilitated diffusion in microbial cells.
Describe the role of nitrogen in microbial nutrition.
Describe the role of permeases in microbial nutrition.
A scientist is studying a bacterium that grows only in the presence of organic carbon sources and cannot use light or inorganic compounds for energy. What is the nutritional classification of this bacterium?
A culture medium contains glucose, ammonium chloride, magnesium sulfate, potassium phosphate, and trace elements, but no organic growth factors. Which type of microorganism would be able to grow in this medium?
(1) Prototroph
(2) Auxotroph
(3) Photoheterotroph
(4) Obligate parasite
A researcher isolates a microorganism from a deep-sea hydrothermal vent. The organism uses hydrogen sulfide (H2S) as an energy source and carbon dioxide (CO2) as a carbon source. Classify this microorganism based on its nutritional type and justify your answer.
Which of the following best describes a heterotroph?
(1) Uses inorganic compounds as a carbon source
(2) Uses organic compounds as a carbon source
(3) Uses light as an energy source
(4) Uses carbon dioxide as an energy source
Which of the following best describes group translocation in bacteria?
(1) Movement of molecules against a concentration gradient using ATP
(2) Transport of molecules with modification during passage through the membrane
(3) Movement of molecules through channel proteins
(4) Uptake of large particles by engulfment
Which of the following best describes the function of siderophores?
(1) Transporting glucose into the cell
(2) Binding and transporting iron into the cell
(3) Synthesizing ATP
(4) Breaking down proteins
Which of the following best describes the nutritional classification of Escherichia coli?
(1) Photoautotroph
(2) Chemoheterotroph
(3) Chemoautotroph
(4) Photoheterotroph
Fill in the blank: Microorganisms that obtain both energy and carbon from organic compounds are called ________.
Fill in the blank: Microorganisms that require high concentrations of salt for growth are called ________.
Fill in the blank: Microorganisms that use reduced inorganic compounds as electron donors are called ________.
Fill in the blank: The movement of molecules from an area of higher concentration to an area of lower concentration without energy input is called ________.
Is facilitated diffusion an energy-dependent process?
Is it true that all microorganisms can fix atmospheric nitrogen?
Is the following statement true or false? 'Obligate anaerobes can survive in the presence of oxygen.'
True or False: All bacteria require organic compounds as their sole source of carbon.
