Cells transplanted from the neural tube of a frog embryo to the ventral part of another embryo develop into nervous system tissues. This result indicates that the transplanted cells were _____
A) totipotent
B) determined
C) differentiated
D) mesenchymal
B
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Which brain structure is incorrectly matched with its function?
a. thalamus?relays messages to cerebrum b. pons?regulates emotional response c. medulla?regulates coughing and sneezing d. cerebellum?regulates muscle coordination e. inferior colliculi?regulate auditory reflexes
What factor most influences the dry deserts of Nevada?
A) the hot desert sun B) the Pacific Ocean C) overgrazing by livestock D) the rain shadow from a California mountain range
What determines the structure of a protein?
A) the number of amino acids it contains B) the sequence of the amino acids it contains C) the function of the nucleic acids it contains D) the number of fatty acids it contains
Cytopathic effects are changes in host cells due to
A) viral infections. B) protozoan infections. C) fungal infections. D) bacterial infections. E) helminthic infections.