Ocean currents in the Northern Hemisphere such as the Gulf Stream run in what direction?
A. counterclockwise
B. clockwise
C. north to south
D. south to north
E. always from the tropics to the pole
B. clockwise
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Conjugation is useful for determining relatedness between bacteria at the species level because it never occurs between organisms of different genera.
Answer the following statement true (T) or false (F)
Reverse-transcriptase PCR ____
a. uses Taq polymerase to produce cDNA copies of RNA transcripts b. uses RNA polymerase to amplify cDNA copies of RNA transcripts c. uses RNA polymerase to produce mRNA copies of a gene d. amplifies cDNA copies of RNA transcripts e. uses reverse transcriptase to produce mRNA copies of a gene
Sea cucumbers will ____ when environmental conditions deteriorate
a. eject their digestive tract, respiratory structures, and gonads b. crawl to an area with more favorable conditions c. form a resistant spore d. float to the surface and then later drop to a more favorable location e. crawl deep into the ocean mud on the bottom
What is the function of the Casparian strip in the root?
A. It protects the surface of the root but allows water to be absorbed. B. It allows for horizontal transport of water and nutrients. C. It is the portion of the root that contains numerous root hairs. D. It is an internal water-proofed layer that prevents water and minerals from moving through intercellular spaces on their way to the vascular tissue. E. It seals the surface of roots that have been damaged.