Compare the operation and function of a trickling filter system and activated sludge
What will be an ideal response?
Answer: Both systems are used as a secondary aerobic treatment method to oxidize organic material. A trickling filter system involves wastewater being slowly passed through a thick layer of crushed rocks. The large surface area of the rock allows for sufficient oxygenation. The rock's surface is coated with a biofilm that actively removes soluble organic material in the wastewater and mineralizes it to CO2. Activated sludge wastewater is continually mixed and aerated in large tanks. Extensive flocs of microbial biomass form, which absorb and mineralize the organic material to CO2. After effluent leaves the aeration tank, the flocs are allowed to settle. Some of the floc is returned to the tank to maintain sufficient biomass and a high rate of mineralization. This is unnecessary in a trickling filter system because the biomass is attached to the rock in an extensive biofilm. Both systems use oxygen to mineralize organic matter in wastewater, in contrast to an anaerobic bioreactor.
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The Na+/K+ pump creates a ____ charge inside the cell and a ____ charge outside the cell
a. negative; negative b. positive; negative c. positive; positive d. negative; positive e. neutral; positive
The __________is structurally and functionally linked with the pituitary gland as a major center for __________
control. Fill in the blank(s) with the appropriate word(s).
It is 6:00 PM and the sun is due west of the hive. A honeybee has just returned to its hive from a patch of flowers that are due north of the hive. Which of the following best describes the type of waggle dance that this bee should perform? Note: The waggle run is the straight part of the dance.
A. The waggle run should be 90° to the right of the vertical axis. B. The waggle run should be 90° to the left of the vertical axis. C. The waggle run should be 45° to the right of the vertical axis. D. The waggle run should be straight up the vertical axis. E. The waggle run should be straight down the vertical axis.
Which is not a function which the cytoskeleton performs?
A) transport of vesicles and organelles B) protection from external forces C) movement of chromosomes during cell division D) passive transport of substances through the plasma membrane E) movement of the cell