Which of the following is responsible for causing gas gangrene?
A. Clostridium acetobutylicum
B. Clostridium tetani
C. Clostridium perfringens
D. Clostridium botulinum
Answer: C
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Honeybee workers spend their first few weeks as young adults tending the colony's brood, then later shift jobs to foraging for food outside the colony
When researchers fed the young bees candy spiked with the molecule ethyl oleate, the young bees continued to babysit and delayed the job shift to foraging. What would it require to demonstrate that ethyl oleate normally acts as a pheromone, not as an endocrine or paracrine signal? A. It would require demonstration that ethyl oleate binds to a receptor and initiates a series of responses. B. It would require demonstration that ethyl oleate is released by another individual of the same species. C. It would require demonstration that ethyl oleate is released by a predator and causes a behavioral change in the prey.
The PhyloCode is a set of rules for ____
a. naming organisms using traditional taxonomic groups b. classifying organisms into Linnaean hierarchies c. identifying and naming clades d. creating binomial species names e. insuring strict monophyly in classification
What is the significance of buffers in biological systems?
A) They are usually involved in chemical reactions that result in energy production. B) They help maintain homeostasis with respect to pH. C) They are not present and are therefore insignificant in biological systems. D) They help maintain a constant temperature in biological systems.
Select the correct sequence of vertebrate development beginning with fertilization.
A. fertilization ? gastrulation ? cleavage ? neurulation ? neural crest formation ? organogenesis B. fertilization ? cleavage ? gastrulation ? neurulation ? organogenesis ? neural crest formation C. fertilization ? neurulation ? gastrulation ? organogenesis ? neural crest formation ? cleavage D. fertilization ? gastrulation ? neurulation ? neural crest formation ? cleavage ? organogenesis E. fertilization ? cleavage ? gastrulation ? neurulation ? neural crest formation ? organogenesis