Carriers of Hepatitis B virus are not common.
Answer the following statement true (T) or false (F)
False
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In agarose gel electrophoresis, DNA is visualized by ____
a. staining the gel with an agarose-binding dye so the gel, but not the DNA bands, fluoresces under UV light b. staining the DNA with a DNA-binging dye that fluoresces under natural light c. staining the DNA with X-gal so that the DNA bands appear blue d. staining the gel with a DNA-binding dye that fluoresces under UV light e. staining the gel with a DNA-binding dye that fluoresces under natural light
Skin color is not a good way to distinguish "races" of people because
A) it can be changed by environmental factors. B) it is but one of many traits that vary within and between human populations. C) it is not inherited. D) it changes over a person's lifetime.
You have blood type O and need a transfusion. Which donor would be best?
a. type O b. type AB c. type B d. type A
Which of the following statements is true?
a. Presently, extinctions are occurring at a very slow pace. b. Mutations, both contemporary and prehistoric, have been the single greatest cause of extinctions. c. The fossil record indicates that there has been very little animal extinction until recently. d. Evolutionary history is often represented by extinctions. e. Organisms compete for limited resources in all environments, possibly leading to extinctions of some.