18 Questions
What are the major groups of protists described in the text?
Bacteria and Algae
How do bacteria usually multiply?
By binary fission
What is the practical significance of bacteria mentioned in the text?
Cause diseases, natural cycling, spoil food, make food.
What is the common feature of all algal cells?
Contain chlorophyll and capable of photosynthesis
Where are algae found?
In aquatic environments or in damp soil
What is the practical significance of Cyanobacteria (Blue Green Algae) as mentioned in the text?
Diazotrophs, build up soil organic matter, enhance water holding capacity of soil, act as soil conditioner, energize phosphate solubilizers, produce phyto hormones.
What is the main characteristic of fungi mentioned in the text?
Eucaryotic lower plants devoid of chlorophyll
How are fungi usually structured?
Usually multicellular but not differentiated into roots, stems, and leaves
How is growth controlled in a turbidostat?
By adjusting the dilution rate to keep constant turbidity
What is the purpose of a photostat in controlling growth rates?
To get steady state cultures of photosynthetic organisms
Why can exponential growth not occur indefinitely in a closed system?
Due to the exhaustion of nutrients or accumulation of toxic products
What happens in the stationary phase of bacterial growth?
Slow loss of cells through death balanced by formation of new cells through growth and division
If a single bacterium with a 20-minute generation time grows exponentially for 48 hours, how much weight can its population reach?
About 4000 times the weight of the earth
Why doesn't exponential growth occur indefinitely in nature?
Growth is limited or ceased due to nutrient exhaustion or accumulation of toxic products
How is the growth rate controlled in a turbidostat?
By adjusting the dilution rate based on the turbidity of the culture vessel
What is the role of the photostat in culturing photosynthetic organisms?
To obtain steady state cultures
What happens to the total cell count in the stationary phase?
It slowly increases
Why does exponential growth cease in closed systems?
Due to nutrient depletion or toxic product accumulation
Learn about the major groups of protists, including Procaryotic Protists such as Bacteria and Algae.
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