17. The reason for differences in the sets of proteins expressed in a nerve and a pancreatic cell of the same individual is that nerve and pancreatic cells contain different________. (A) genes (B) regulatory sequences (C) promoters (D)sets of regulatory proteins

5.Density-dependent inhibition is explained by which of the following processes? (A) As cells become more numerous, the protein kinases they produce begin to compete with each other, such that the proteins produced by one cell essentially cancel those produced by its neighbor. (B) As cells become more numerous, the cell surface proteins of one ceill contact the adjoining cells, and they signal each other to stop (C) As cells become more numerous, they begin to squeeze against each other, restricting their size. (D)As cells become more numerous, the level of waste products increases, which slows metabolism and inhibits growth.

17. The reason for differences in the sets of proteins expressed in a nerve and a pancreatic cell of the same individual is that nerve and pancreatic cells contain different________.
(A) genes
(B) regulatory sequences
(C) promoters
(D)sets of regulatory proteins

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