It is a fact that enzymes are highly specific and will only catalyze one or a few reactions. Can you
think of a benefit that is derived from such specificity? (i.e. What would happen if most biochemical
reactions were catalyzed by the same enzyme?) What will be an ideal response?
Concepts to Consider: Having specific enzymes allows the cell to control and regulate the
biochemical reactions within it; if only one enzyme were responsible for all catalysis within a cell,
then all reactions would proceed simultaneously, which is unacceptable
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The evolution of initiation of limb development in tetrapods is best explained by
A. a new gene mutation. B. the modification of an existing gene for a new function. C. homoplastic convergence. D. gene duplication and divergence. E. conserved genes.
Which of the following structural motifs are notcommonly found in the DNA-binding motifs of proteins that act as transcriptional regulators?
A. homeodomain B. leucine zipper C. ?-barrel D. helix-turn-helix
Why are some experts concerned about the use of the Bt toxin in agriculture?
a. Insects may develop resistance to the Bt toxin. b. The Bt toxin may be harmful to most mammals. c. The Bt toxin is not approved for organic farming. d. New diseases are introduced by the Bt toxin.
Which of the following hypersensitivities are T cell-mediated responses against self-antigens or otherwise harmless antigens?
A) type IV hypersensitivities B) type I hypersensitivities and type II hypersensitivities C) type II hypersensitivities D) type III hypersensitivities E) type I hypersensitivities