A researcher uses a probe complementary to the gene of interest and performs a colony hybridization experiment on a plate containing many bacterial colonies. Each bacterial colony contains a recombinant vector with a different piece of chromosomal DNA. What can be learned from this experiment?
A. The researcher can determine the level of expression for each gene represented.
B. The researcher can identify colonies that contain the gene of interest.
C. The researcher can identify colonies that have not taken up a vector.
D. The researcher can determine the amount of mRNA in a specific colony.
E. The researcher can determine the amount of DNA in each of the colonies.
B. The researcher can identify colonies that contain the gene of interest
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After some time, the tip of a plant that has been forced into a horizontal position grows upward. This phenomenon is related to _____
A) calcium release from the endoplasmic reticulum of shaded cells B) whether the plant is in the northern or southern hemisphere C) gibberellin production by stems D) auxin production in cells receiving red light E) auxin movement toward the lower side of the stem
Which of the following cannot be determined from the fossil record?
A. diversity has changed through time B. evidence of every species that ever existed C. Evidence of prior natural disaster / catastrophes exist D. Geologic uplift has occurred E. Transitional fossils exist
Describe how testosterone concentrations are regulated by negative feedback mechanisms. What will be an ideal response?
Acetylcholine esterase breaks acetylcholine into muscarinic acid.
a. true b. false