In biology, an evolutionary innovation is also referred to as a
a. derived character
b. taxonomic group
c. molecular clock
d. physical similarity
Ans: a. derived character
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Icosahedral viruses are constructed from ring- or knob-shaped units called ________.
Fill in the blank(s) with the appropriate word(s).
XLD agar serves which purpose when used in the bacterial fecal culture?
a. Evaluation of general flora and predomi-nant species b. Selection of enteric pathogens such as Salmonella, Aeromonas, and others c. Inhibition of normal flora and selection of enteric pathogens d. Enrichment for enteric pathogens such as Salmonella and others
The pancreas is located between the ____ and the ____
a. gallbladder; liver b. liver; stomach c. liver; small intestine d. stomach; small intestine e. stomach; liver
Which of the following is true of the analysis of DNA fragments using gel electrophoresis?
A. DNA has an overall negative charge and moves to the positive pole. B. An electric current through the gel causes DNA fragments to migrate. C. DNA fragments are stained to visualize them. D. Larger DNA fragments move slowly and remain closer to the wells. E. All of these choices are correct.