When a chemical signal from a group of embryonic cells causes a different, nearby group of cells to embark on a particular developmental course (say, differentiating into a leg), the interaction between the two groups of cells is called
A) induction.
B) coordinated differentiation.
C) implantation.
Answer: A
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Various strains of E. coli
A. may cause disease. B. may be harmless. C. are all exactly the same. D. are all very different from one another. E. may cause disease AND may be harmless.
Which two systems in the human body are devoted exclusively to the regulation of organ function?
A. endocrine and circulatory systems B. respiratory and circulatory systems C. nervous and circulatory systems D. nervous and endocrine systems E. respiratory and nervous systems
How does the introduction of predators to a habitat decrease the effects of competition between two other species?
What will be an ideal response?
The symptoms and signs of Luft’s Syndrome include
all of the following EXCEPT a. high oxygen consumption. b. constant fever. c. flushed skin. d. abnormally shaped mitochondria. e. low number of mitochondria