To fight the recent outbreak of Zika virus in the Americas, scientists took advantage of ________ to force a gene to be passed on to progeny that resulted in short-lived offspring that did not reach maturity
A) gene drive B) selective breeding C) CRISPR-Cas D) DNA vaccines
Answer: A
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Which of the following statements best describes DNA polymerase?
A. It is an enzyme required to produce a primer needed for DNA replication. B. It is an enzyme that catalyzes the addition of nucleotides to the 5? end of a growing DNA strand. C. It is an enzyme that catalyzes the addition of nucleotides to the 3? end of a growing DNA strand. D. It is an enzyme required to glue pieces of DNA fragments together. E. It is an enzyme that polymerizes the DNA and keeps the replication fork open.
A 26-year old woman, eight months pregnant, visits her obstetrician complaining of fever, myalagia and back ache of recent onset. Three weeks earlier, the patient had been a weekend guest at a rural farm-house, where all the food was reported to be "unprocessed" and "natural." A culture of the patient's blood shows listeria. What is the most likely source of the woman's infection?
A. well-done roast beef B. fresh, raw cow's milk C. home-baked bread D. homemade apply sauce E. baked apple pie
A protein is a ________ of amino acids
A) monomer B) polymer C) bilayer D) solution E) decomposition product
DNA ligase links two ____ DNA fragments by ____ bonds
a. complementary; hydrogen b. circular; covalent c. palindromic; covalent d. linear; covalent e. linear; hydrogen