Which of the following is a neurotransmitter that triggers a contraction of a voluntary muscle?
A) acetylcholine B) action potential C) synapse D) sodium
Answer: A
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Which one of the following is the most common contaminant of blood cultures?
A) Staphylococcus aureus B) Staphylococcus epidermidis C) Streptococcus pneumoniae D) Streptococcus pyogenes
Quality control should be performed on which two organisms to determine the validity of the nitrate reduction test?
a. Pasteurella aerogenes and Pasteurella dagmatis b. M. haemolytica and Pasteurella pneumo-tropica c. P. multocida and Suttonella indologenes d. Pasteurella canis and Pasteurella bettyae
Parasitism is a type of symbiotic association
a. True b. False
Which trait is least consistent with evolution by sexual selection?
a. males are larger than females b. females actively choose superior males c. males often bear showy or defensive structures d. males gather and defend harems of females e. female queen bees are responsible for reproducing