What is the natural function of restriction endonucleases?
a. research applications
b. DNA manipulation in vitro
c. defense against viruses that infect bacteria
d. regulating bacterial gene expression
e. breaking phosphodiester bonds in mammalian DNA
ANSWER: c
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Polonium is a rare element with 33 radioisotopes. The most common one, 210Po, has 82 protons and 128 neutrons. When 210Po decays, it emits an alpha particle, which is a helium nucleus (2 protons and 2 neutrons). 210Po decay is tricky to detect because alpha particles do not carry very much energy compared to other forms of radiation. They can be stopped by, for example, a sheet of paper or a few
inches of air. That is one reason that authorities failed to discover toxic amounts of 210Po in the body of former KGB agent Alexander Litvinenko until after he died suddenly and mysteriously in 2006 . What element does an atom of 210Po change into after it emits an alpha particle? What will be an ideal response?
The metabolic rate of individuals is influenced by
A. the amount of body fat. B. age. C. weight. D. All of the answer choices are correct. E. the amount of thyroxin produced by the thyroid.
Microsporidia are unicellular parasites of animals
____________________ Indicate whether the statement is true or false.
Reactions involving ligases are typically ________ reactions.
A. anabolic B. catabolic C. both anabolic and catabolic D. neither anabolic nor catabolic E. exergonic