Which of these adaptations to a terrestrial existence evolved most recently?
A) vascular tissue
B) seeds
C) lignin
D) cuticle
B
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One feature of "engineered" plasmids that is helpful in the isolation and analysis of cloned DNA is:
a. they can only handle DNA fragments of up to 10 kb. b. that they are an integral part of all eukaryotic cells. c. they contain no genetic material of their own so that the cloned fragment is truly isolated. d. the presence of genes that allow transformed cells to survive on different media. e. the base sequence of one strand reads the same asits complement
At some point in their life cycle, amphibians may respire via all of the following except:a
gills. b. lungs. c. swim bladder. d. skin. e. book lungs
What do scientists consider when they perform a cladistic analysis?
a. only the DNA of organisms b. all traits of organisms c. derived characters d. only physical similarities
The polio vaccine currently administered in the U.S., known as IPV, is an example of a(n) ________ vaccine
A) attenuated B) whole inactivated C) subunit D) toxoid E) recombinant