Birds have
A. a backcurrent lung.
B. an air sac lung.
C. a parabronchial lung.
D. a negative pressure lung.
E. a tracheal lung.
C. a parabronchial lung.
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A dendrite of a sensory neuron is classified as a(n) ____
a. free nerve ending b. encapsulated receptor c. sensory receptor d. sensory stimulus e. tertiary sensory neuron
Calcium ions may act as second messengers by binding to __________, which then regulates other
proteins. a. adenylyl cyclase b. cyclic AMP c. calmodulin d. phosphodiesterase e. protein kinase
Petrels (a flying and diving seabird) are thought to be one of the closest living relatives to penguins. What type of genes would be most likely to exhibit different expression patterns between these species?
A. Genes controlling skeletal development. B. Genes regulating the digestive tract. C. Genes controlling organ development. D. Genes regulating salt water tolerance.
What evidence led to the confirmation that Albert DeSalvo was the Boston Strangler?
A) an analysis of blood types from the crime scene B) an analysis of fingerprints from the crime scene C) an analysis of DNA from the crime scene D) an analysis of witness testimony from the crime scene