What is the difference between trans- and cis-acting regulatory factors? Design an experiment that allows you to prove your answer to the question
What will be an ideal response?
Answer: Trans-acting factors can regulate product regardless of where the gene is located within the genome. On the other hand, cis-acting factors need to be adjacent to the region being regulated in order to exert their effects. The designed experiments should support these findings. The lac operon provides excellent examples of support.
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Oscillation of the small intestion does all of the
following EXCEPT a. move the food along the small intestine. b. churn the food. c. bring the contents to the wall of the tract where they can be absorbed. d. package the food into small portions. e. mix the contents together.
In the last lab, you used the PHYLIP program to create unrooted phylogenetic trees. Why was it important to "root" the phylogenetic tree after you created it?
A. Unrooted trees are not necessary to the organisms you are trying to study B. In the unrooted trees the outgroup might not branch off prior to the common ancestor of the organisms under study C. In the unrooted trees the outgroup is not connected to the rest of the tree by a common ancestor D. Unrooted trees do not follow the Law of Parsimony
Which of the following best describes a polymerase?
a. It is an enzyme that blocks the formation of nucleic acids. b. It is an enzyme that slows the formation of DNA. c. It is an enzyme that catalyzes the formation of nucleic acids. d. It is a ribosome that catalyzes the formation of nucleic acids.
Steroid hormones act more slowly and maintain their effects longer than peptide hormones.
Answer the following statement true (T) or false (F)