What substance builds coral reefs?
A) the limestone skeletons of dead coral
B) rock formations on the ocean floor
C) inactive volcanoes
D) the skeletal remains of fish
A
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In living seed plants, a megasporangium and its integument together form a(n) ____
a. seed b. pollen grain c. ovary d. mature ovule e. immature ovule
Which of the following is NOT true of enzyme
behavior?
a. Enzyme shape may change during catalysis. b. The active site of an enzyme orients its substrate molecules, thereby promoting interaction of their reactive parts. c. All enzymes have an active site where substrates are temporarily bound. d. Each enzyme can catalyze a wide variety of different reactions. e. Enzymes make reactions occur at a faster rate.
New World monkeys evolved approximately 30 million years ago. These animals are easy to identify because they
A. have opposable thumbs and binocular vision. B. have protruding noses and prehensile tails. C. have opposable thumbs and protruding noses. D. have flattened noses and prehensile tails. E. have prehensile tails and hair.
In 1940, two researchers named Weiner and Landsteiner discovered that about 85 percent of the human population sampled possessed a blood cell protein that had been previously detected in Rhesus monkeys. This blood type was labeled Rh positive, and Rh+ was found to be dominant over the absence of the blood factor (Rh-). Under normal Mendelian inheritance, which of the following statements is FALSE?
A. An Rh- child would require that both parents be carriers of at least one Rh- gene. B. Two Rh- parents could have an Rh+ child. C. It is possible with just one pair of parents to have children where some siblings are Rh- and some are Rh+. D. Two Rh+ parents could have an Rh- child. E. All of the choices are false.