James has been having trouble digesting lean steaks and other protein-rich foods, and these foods seem to stay in his stomach longer than usual. James is likely lacking the enzyme ________.
A. glucagon
B. pepsin
C. amylase
D. bile
E. lipase
Answer: B
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a. Asteroidea b. Ophiuroidea c. Echinoidea d. Crinoidea
What evidence suggests when oxygen gas first
became a significant part of Earth’s atmosphere?
a. multi-celled microorganisms that breathed oxygen b. fossils of dinosaurs c. molten rock from volcanoes that were rich in oxygen d. rusty rocks indicating oxidized iron e. the presence of water vapor in the atmosphere
Which of the following is not made of keratin?
A. fingernails B. claws C. hair D. antlers E. hooves
Which of the following is NOT a characteristic of protozoa?
A) Most exhibit asexual reproduction. B) They are single-celled organisms. C) They are eukaryotic organisms. D) They are all photosynthetic. E) They frequently possess cilia or flagella.