Speciation usually requires a period of geographic isolation (allopatry) that facilitates the evolution of reproductive isolation
a. true
b. false
Answer: a. true
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DNA is cut by ____
a. nucleases b. proteases c. stem cells d. Ti plasmids e. restriction fragment length polymorphisms
The most common mode of disease transmission in UTIs is ________.
A. opportunism B. aerosol C. endogenous transfer D. fomites E. indirect contact
Colon polyps____
a. are mostly benign but some may become cancerous b. are difficult to cure c. are small growths that project from the wall of the small intestine d. are responsible for 500,000 deaths in the U.S. every year e. are usually benign but may become cancerous and are responsible for 500,000 deaths in the U.S. every year
Which of the following describes the direction in which nucleotides are added onto a growing DNA strand during DNA replication in cells?
a. in the 3' ? 5' direction for the leading strand, and the 5' ? 3' direction on the lagging strand b. in the 5' ? 3' direction only c. in the 5' ? 3' direction for the leading strand, and the 3' ? 5' direction on the lagging strand d. in either the 5' ? 3' direction or the 3' ? 5' direction on both strands, depending on where replication begins