You conduct an experiment in which you inactivate Ras proteins in fibroblast cells. Which of the
following is the most immediate consequence of this procedure?
a. The fibroblasts synthesized excess G protein.
b. The fibroblasts synthesized excess DAG.
c. The fibroblasts no longer responded to calmodulin.
d. The fibroblases no longer synthesized DNA in response to growth factors.
e. The fibroblasts divided uncontrollably.
D
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Nanoarchaeum equitans is a parasite of which of the following organisms?
a. Homo sapiens b. Escherichia coli c. Ignicoccus hospitalis d. Saccharomyces cerevisiae
Explain why the presence of many Archaea has been confirmed only by community sampling of rRNA genes and not by culture in the laboratory. How has metagenomics helped to solve this problem?
What will be an ideal response?
What specialized structure do crustaceans use to sense gravity?
a. antennae b. maxillae c. mandibles
d. statocysts e. swimmerets
Consider the thermodynamic properties of chemical reactions. Even though enzymes do not affect the overall energy of the reactants or the products ( the thermodynamics), they alter the speed of the reaction. Enzymes accomplish this by doing which of the following?
A.) increasing the activation energy of a reaction B.) not altering the activation energy of a reaction C.) reducing the activation energy of a reaction D.) eliminating the activation energy of a reaction E.) supplying the activation energy for a reaction