Once a probe has hybridized with a gene of
interest in a DNA library, how is the hybrid
identified?
a. by its sticky tail
b. by its radioactive phosphate group
c. by using restriction enzymes
d. by centrifugation
e. by vector analysis
B
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Contrast Mendel's model of heredity with the blending model. Which one is a better description of the way traits are passed from one generation to the next?
What will be an ideal response?
What type of vascular tissue conducts water and dissolved minerals throughout the plant?
a. xylem b. phloem c. sclereids d. companion cells e. sieve tubes
Which of the following is the least successful method
of birth control? a. early withdrawal b. a condom alone c. a spermicidal jelly or foam alone d. douching e. the Pill
What is a more accurate description for the secondhand smoke emitted by a lit cigarette combined with the smoke exhaled by active smokers?
A) passive smoke B) environmental tobacco smoke C) active smoke D) dirty air