The anaerobic organisms used in sewage treatment may produce the useful product(s)
A. oxygen.
B. nitrogen.
C. carbon monoxide.
D. methane.
E. nitrogen AND carbon monoxide.
D. methane.
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Chemicals in tobacco smoke can cause
a. DNA to break into pieces. b. mispairing of bases. c. kinking in the DNA molecule. d. the formation of nucleotide dimers. e. covalent bonding between adjacent adenine bases.
Which of the following describes the effector response of sweat glands and blood vessels?
a. sweat glands release sweat and blood vessels dilate b. sweat glands stop releasing sweat and blood vessels dilate c. sweat glands release sweat and blood vessels constrict d. sweat glands stop releasing sweat and blood vessels constrict
If healthy men have a range of body fat from 3 to 29% and healthy women have a range of body fat from 12 to 32%, what would you predict for the sex of an individual having 20% body fat?
A) The individual is male. B) The individual is female. C) The individual's sex can't be predicted from body fat percentage. D) No one has 20% body fat.
Which proteins puncture the membranes of infected target cells?
A. interleukin-2 B. MHC proteins C. complement proteins D. interleukin-1 E. perforins