Intermittent sterilization, which uses 3 days of lower temperature steam for short periods of time, is also called ________.
A. desiccation
B. pasteurization
C. disinfection
D. tyndallization
E. incubation
Answer: D
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Myofibril contractile subunits, the sarcomeres, are bounded on each end by a disc of protein called the
A. A band. B. M line. C. H band. D. I band. E. Z line.
Substances that start chemical reactions are called
a. substrata. b. starters. c. promoters. d. reactants. e. products.
Thyroid hormone is actually _____
a. a signal steroid hormone working alone b. the triiodothyronine and thyroxine molecules working together c. the estrogen and testosterone hormones working together d. TRH and any other hormone working together e. a second messenger or a steroid working alone
The nervous system develops enough to permit reflex actions during which period of development?
A. fetal, months 3-4 B. embryonic, weeks 2-3 C. embryonic, weeks 4-5 D. embryonic, weeks 6-8 E. pre-embryonic