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.
D. add reverse transcriptase and fluorescent nucleotides to the mRNA to make cDNA.
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At a source the phloem typically has a water potential that is ____ that in surrounding xylem
a. lower than b. about the same as c. higher than d. exactly the same as e. less negative than
This type of selection favors both extremes of the phenotype spectrum within a population
a. directional b. stabilizing c. disruptive d. natural e. neutral
This animal has tentacles, beaklike mouth
parts, and a radula. This animal is ___.
a. a squid b. a nautilus c. a clam d. an earthworm e. more than one of these
Which of the following breaks most slowly during decomposition
A) simple sugars
B) cellulose
C) chitin
D) lignin