The primary driving force behind winds, ocean currents, and the global water cycle is
A) Earth's rotation.
B) heat produced by the sun.
C) Earth's magnetic field.
D) the gravitational pull of the moon.
E) geothermal heating from beneath Earth's surface.
B
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Which of the following is not a cellular activity associated with microtubules?
A) maintenance of axons B) cell shape C) orientation of cellulose microfibrils D) cilial structure E) mititotic spindle
You are working in a cancer lab and are interested in identifying some genes that are important in the onset of lung cancer. You have several genes you think may be involved, so you "print" spots of the DNA sequences of interest on a microarray slide. After doing this, you isolate mRNA from both normal lung cells and cancerous lung cells. Before you use these mRNAs to probe the microarray slide, you need to
A. make cDNA and amplify the cDNA using PCR. B. amplify the mRNA using PCR. C. clone each mRNA into a BAC vector. D. add reverse transcriptase and fluorescent nucleotides to the mRNA to make cDNA. E. sequence the mRNA.
What is an innate behavior that results in movement toward or away from a stimulus?
a. reflex b. kinesis c. habituation d. taxis
A molecule that closely resembles the shape of a substrate for an enzyme would most likely serve as a
A. allosteric activator. B. competitive inhibitor. C. allosteric inhibitor. D. noncompetitive inhibitor.