Gas exchange in all living organisms requires
A. gills
B. lungs
C. tracheoles
D. moist membranes
E. blood
Ans: D. moist membranes
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Evolutionary studies that use comparative morphology to analyze the structures of related organisms are primarily
based on comparisons of homologous traits.
a. True b. False
Gene flow has a greater effect on large populations than on small populations
a. true b. false
In an EKG, what does the QRS wave indicate?
A) first heart sound B) electrical signal over the atria C) second heart sound D) electrical signal over the ventricles
A new DNA strand elongates only in the 5' to 3' direction because
A) DNA polymerase begins adding nucleotides at the 5' end of the template. B) Okazaki fragments prevent elongation in the 3' to 5' direction. C) the polarity of the DNA molecule prevents addition of nucleotides at the 3' end. D) replication must progress toward the replication fork. E) DNA polymerase can only add nucleotides to the free 3' end.