Which characteristic is common to all molluscs?
A) brain
B) tentacles
C) open circulatory system
D) radula
E) mantle
Answer: E
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A key is placed into a keyhole then turned and the door opens. Which of the following components of cell signaling would best correspond to turning the key?
A. the hormone B. the receptor C. conformational change in the receptor once bound to the hormone D. signal transduction E. the cell response
What is peristalsis?
A. a process of fat emulsification in the small intestine B. voluntary control of the rectal sphincters regulating defecation C. the transport of nutrients to the liver through the hepatic portal vein D. loss of appetite, fatigue, dehydration, and nervous disorders E. smooth muscle contractions that move food through the alimentary canal
Nucleoli contain many tandem repeat copies of which genes, transcribed by RNA polymerase I?
A) mRNA B) tRNA C) rRNA D) siRNA E) all of the above
Evidence shows that some grasses benefit from being grazed (eaten by herbivores). Which of the following terms would best describe this plant-herbivore interaction?
A) parasitism B) competition C) predation D) commensalism E) mutualism