Gel ________ is a process that separates DNA or protein fragments according to their size, by causing them to migrate within a gel in response to an electric field.
A. duplication
B. blotting
C. electrophoresis
D. migration
C. electrophoresis
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The primary role of oxygen in cellular respiration is to _____
A) yield energy in the form of ATP as it is passed down the respiratory chain B) act as an acceptor for electrons and hydrogen, forming water C) combine with carbon, forming CO2 D) combine with lactate, forming pyruvate E) catalyze the reactions of glycolysis
The purple nonsulfur bacteria
A. utilize organic molecules as a source of electrons for photosynthesis. B. typically can grow aerobically in the dark as chemoorganoheterotrophs. C. grow anaerobically as photoorganoheterotrophs. D. All of the choices are correct.
A pine tree is called a sporophyte because it
a. develops from a germinated spore. b. produces spores by meiosis. c. is haploid. d. undergoes fertilization. e. reproduces by both sexual and asexual means.
The various energy levels in an atom of magnesium ( 12
24 Mg) have different numbers of electrons. Use the following numbers to answer questions 68–70. a. 1 b. 2 c. 3 d. 6 e. 8 D 68. number of electrons in the first energy level D 69. number of electrons in the second energy level D 70. number of electrons in the third energy level