Anti-Rh antibodies may not cross the placenta
Indicate whether this statement is true or false.
FALSE
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An agar block filled with auxin is placed on top of a shoot that has had the shoot tip removed. The agar block is placed
so that it covers only one side of the top of the shoot. You would expect the shoot to ____.
a. stop growing b. grow faster on the side away from the agar block c. grow straight up d. grow faster on the side with the agar block e. grow faster on both the side away from the agar block and on the side with agar block
When a forest fire destroys a habitat, but secondary succession allows the forest to be rebuilt, the new forest will continue to be modified over the years until equilibrium is reached and what has formed?
a. population b. primary community c. climax community d. ecosystem
________ traits are often polygenic.
Fill in the blank(s) with the appropriate word(s).
Which of the following describes a mechanism that eukaryotic organisms can employ to alter protein production as an alternative to regulating transcription initiation?
A. Catabolite repression plays a role in the synthesis of proteins that break down alternatives to glucose-if the substrate is not present, the proteins will not be made. B. During times of cell starvation, the second messenger ppGpp destabilizes the DNA open complexes that code for rRNA and tRNA, saving energy by halting protein synthesis. C. RNA molecules within the spliceosome can direct alternative splicing of the primary transcript so that different proteins can be made from the same coding region. D. A phosphorelay signal transduction mechanism directs the repression or induction of certain eukaryotic genes to regulate the protein end-products.