Which group of fishes gave rise to the amphibians?
A) Ray-finned fishes
B) Lobe-finned fishes
C) Cartilaginous fishes
D) Jawless fishes
B
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Which of the following is the primary site of nutrient absorption in the mammalian digestive system?
A. pharynx B. stomach C. small intestine D. large intestine E. pancreas
When tobacco plants are damaged by herbivorous caterpillars, they release chemicals called jasmonates into the air that ________
a. signal nearby plants to synthesize bitter alkaloids b. kill the caterpillars over a period of several hours c. attract parasitic wasps that lay eggs in caterpillars d. appear to cause a decrease in the appetite of the caterpillars
Which of the following recombinant DNA technology products is mismatched?
A. Tissue plasminogen activating factor - stimulates blood clotting B. Erythropoietin - stimulates erythrocyte production in bone marrow C. Interferons - stimulate antiviral protein production D. Factor VIII - a protein necessary for the coagulation cascade
Viroids are of economic significance because they cause disease in ________.
A. animals B. plants C. humans D. All of the choices are correct.