Residual chlorine must be maintained in
A) anaerobic sludge digestion.
B) primary sewage treatment.
C) secondary sewage treatment.
D) tertiary sewage treatment.
E) water treatment.
E
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Which organelle is enclosed by a double membrane?
a. ribosome b. nucleus c. lysosome d. peroxisome e. Golgi body
If tyrosine and isoleucine undergo condensation, the new bond that is formed is between the:a
oxygen of the R group and the hydrogen of the amino group. b. carbon of the R group and the nitrogen of the amino group. c. carbon of the carboxyl group and the hydrogen of the R group. d. carbon of the carboxyl group and the hydrogen of the amino group. e. carbon of the carboxyl group and the nitrogen of the amino group.
For humans and most vertebrates, the body is supported primarily by ____
a. an exoskeleton b. only nonskeletal structures c. a hydrostatic skeleton d. an endoskeleton e. joined exo- and endoskeletons
People with autism have lower levels of _____, a hormone that contributes to bonding behavior in other mammals
a. oxytocin b. prolactin c. estrogen d. LH