Conventional secondary biological treatment removes ONLY about 20 percent of phosphorus, so which of the following additional treatments is OFTEN necessary?
a. chemical precipitation with iron
b. removal by phosphorus-degrading organisms (PDOs)
c. removal by phosphorus-accumulating organisms (PAOs)
d. both a and c
Answer: D
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The snottites described in the case study at the beginning of this section are colonies of bacteria, extremophiles that have some unique requirements for life processes
For example, they use sulfur from the hydrogen sulfide in the environment to capture energy. Although most life forms you are familiar with, including humans, don't use sulfur for this purpose, we do use another element to do the same thing. Which element do humans use for this energy conversion? Carefully examine the periodic table. A. carbon B. nitrogen C. hydrogen D. oxygen
During frog gastrulation, cells of the ____ of the blastopore control blastopore formation
a. blastocoel b. archenteron c. hypoblast
d. dorsal lip e. blastodisc
Which of the following is a stop codon of translation?
a. UCA b. UUG c. UGA d. UAC
Extracellular matrix is made up of
a. polysaccharides and fibrous proteins. b. fibrous proteins and lipopolysaccharides. c. polysaccharides and lipopolysaccharides. d. fibrous proteins and complex lipids. e. polysaccharides and complex lipids