Dideoxyribonucleotides (ddNTPs) used for DNA sequencing lack oxygen atoms at ________
A) the 1' carbon of the pentose sugar
B) the 1' and 2' carbons of the pentose sugar
C) the 2' and 3' carbons of the pentose sugar
D) the 3' and 5' carbons of the pentose sugar
E) the 5' carbon of the pentose sugar
C
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The taxonomic classification order, from least specific to most specific is:
a. domain, kingdom, phylum, class, family, order, genus, species. b. domain, kingdom, class, phylum, order, family, genus, species. c. domain, kingdom, order, class, phylum, family, genus, species. d. domain, kingdom, phylum, class, order, family, genus, species.
What would happen if Casparian strips were not present and water and minerals could pass between endodermal cells of the plant root rather than through endodermal cells?
A) An increased concentration gradient of the minerals in the extracellular space of the vascular cylinder would be better maintained. B) Root hairs would lose their ability to take up minerals. C) Minerals would leak back out of the extracellular space of the vascular cylinder as fast as they were pumped into it. D) The minerals would enter the conduction vessels of the vascular cylinder much more rapidly. E) Too much energy would be needed to move the minerals between endodermal cells.
Who played a decisive role in the refutation of theory of 'Spontaneous Generation'?
A. Ignatz Semmelweis B. Alexander Fleming C. Louis Pasteur D. Robert Koch E. Joseph Lister
Heart cells in the embryo will be derived from which germ layer?
A) mesoderm B) ectoderm C) endoderm D) none of the above