In gel electrophoresis, DNA fragments move at different rates because they have different
A) electrical charge densities.
B) sizes.
C) base sequences.
D) amino acid compositions.
E) overall electrical charges.
B) sizes.
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Which of the following occurs during systole?
A. Both ventricles contract. B. Both atria contract. C. The left ventricle contracts. D. The ventricles fill with blood. E. The atria fill with blood.
Researchers tend to name genes based on what happens in their absence. The tinman gene in Drosophila results in
flies a. without hearts. b. with nonjointed legs. c. with a thick exoskeleton. d. with rust colored eyes. e. without brains.
Speciation events that occur when the geographic ranges of the populations involved overlap are termed ________
Fill in the blank(s) with correct word
Which of the following statements about cells is true?
A) All cells have cell walls. B) All cells have internal structures that move. C) All cells are attached to other cells. D) All cells are motile.