The extinction of dinosaurs was probably due to the breakup of Pangaea and the resulting cooling of
the world's climate.
Indicate whether the statement is true or false.
ANS: F, an asteroid impact
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Why does DNA replication proceed continuously on the leading strand and discontinuously on the lagging strand?
a. because DNA polymerase synthesizes DNA in only one direction b. because DNA ligase operates in only one direction c. because DNA polymerase contains more than one subunit d. because DNA polymerase synthesizes DNA in two directions
Which of the following is a structure in which sperm mature and are stored?
A) accessory glands B) testis C) epididymis D) vas deferens
Which characteristic is NOT found in nonliving entities?
a. energetic interactions b. DNA c. atoms d. heat energy e. complexity
Hemoglobin is a protein in white blood cells that destroys pathogens like bacteria
a. true b. false