Blood and lymph may carry
A. antibodies.
B. complement.
C. lysozyme.
D. interferon.
E. All of the choices are correct.
E
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How many experiments have been conducted worldwide to test Darwin's initial hypothesis regarding natural selection?
A. one B. 50 C. 100 D. 500 E. thousands
Which fact correctly distinguishes the archaea from other organisms?
A) They are the only prokaryotic organisms. B) They evolved from modern-day eukaryotes. C) They have cell walls composed of unique polysaccharides. D) They live in moderate environments. E) They are the only group that lacks organelles.
You are observing a population of lizards when you notice that the number of adults has increased and is higher than previously observed. One explanation for such an observation would include
A) reduction in death rate. B) increased immigration. C) increased emigration. D) decreased emigration. E) increased birth rate.
Patients who have type 2 diabetes no longer respond normally to insulin. Which statement best explains this symptom?
A. The signal transduction pathways in the cells no longer exist. B. The nucleus of their cells are altered so that insulin can not bind. C. Type 2 diabetics do not produce insulin. D. The insulin receptors on their cells have mutated. E. Their cells express less insulin receptor.