In the budding yeast, activation of the GTP-binding protein Cdc42 occurs on binding of an external signal (pheromone) to a G-protein-coupled receptor. Activation of Cdc42 promotes actin polymerization
Predict what would happen to actin polymerization, in comparison with pheromone-treated cells, in the following cases.
A. You add pheromone to an inhibitor of G-protein-coupled receptors.
B. You add pheromone to a nonhydrolyzable analog of GTP.
A. Less actin polymerization. Cdc42 will not be able to be activated by the G-protein-coupled receptor.
B. More actin polymerization. Cdc42 will be more active, because it will bind the nonhydrolyzable form of GTP and will not be able to be turned off.
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The control in an experiment
a. makes the experiment valid. b. is an additional replicate for statistical purposes. c. reduces the experimental errors. d. minimizes experimental inaccuracy. e. allows for comparison to the experimental group.
Where does a fertilized egg typically implant?
a. Cervix b. Oviduct c. Vagina d. Ovary E. Uterine lining
In a simple bioinformatics exercise, students are asked to locate the beginning of an ORF among the six possible reading frames for a hypothetical DNA molecule. The first step in their process should involve looking for what sequence?
What will be an ideal response?
Beta diversity, or turnover, would be at its minimum if all species occurred in all habitats within a region. Beta diversity would be at its maximum if each habitat had a unique biota, and regional diversity would equal:
A) the mean of the local diversities of all the habitats within the region. B) the sum of the local diversities of all the habitats within the region. C) the largest among the local diversities of all the habitats within the region. D) the smallest among the local diversities of all the habitats within the region.