The product of which process contains the highest BOD?
A) anaerobic sludge digestion
B) primary sewage treatment
C) secondary sewage treatment
D) tertiary sewage treatment
E) water treatment
B
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Which one of the following statements about rickettsias is false?
A) Diseases caused by rickettsias are arthropodborne. B) Rickets is caused by a Rickettsia species. C) Rickettsia species cause typhus and typhuslike diseases. D) Rickettsias have leaky membranes.
The organism Caenorhabditis elegans, a member of the ____ phylum, is an important model organism for studies of
the genetic control of development.
a. Arthropoda b. Onychophora c. Nemertea d. Annelida e. Nematoda
Which chromosomes are carried by a normal
male butterfly?
a. ZO b. ZW c. WW d. WO e. ZWW
A group of thylakoid discs make up:
a. the stroma. b. a granum. c. a chloroplast. d. a vacuole. e. the mesophyll layer