Bacteria are grown in 15N (heavy) medium and then transferred to 14N (light) medium and are allowed to replicate for 2 generations. The DNA is subsequently isolated and centrifuged in a CsCl2 gradient to yield what type of gradient band(s)?
A. one heavy band.
B. one light band.
C. one half-heavy (intermediate to heavy and light) band.
D. one heavy and one half-heavy band.
E. one light and one half-heavy band.
E. one light and one half-heavy band.
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The lipid layer that forms the foundation of cell membranes is primarily composed of molecules called __________.
A. phospholipids B. fats C. proteins D. carbohydrates
The enzyme responsible for proofreading a growing DNA strand and for replacing mismatched nucleotides is
A. DNA polymerase. B. helicase. C. topoisomerase II. D. DNA ligase. E. DNA replicase.
A more modern equivalent to Koch's Postulates is termed
A. Pasteur's Systematics. B. Hoch's Postulates. C. Atomic Theory. D. Protein Theory. E. Molecular Postulates.
The cycad lineage probably arose from ____
a. club mosses b. seed ferns c. whisk ferns d. ginkgos e. palms