A 68-year-old woman with hematemesis has heartburn and stomach pain. Endoscopy shows inflammation involving the gastric body and antrum as well as a small gastric ulcer. Biopsies were positive for Helicobacter pylori. H. pylori damages the gastric mucosa primarily by increasing mucosal levels of which substance?

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#Question id: 8860

#Unit 9. Diversity of Life Forms

A radially symmetrical animal that has two embryonic tissue layers probably belongs to which phylum?

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#Question id: 8861

#Unit 9. Diversity of Life Forms

Which of the following is true of members of the phylum Cnidaria?

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#Question id: 8862

#Unit 9. Diversity of Life Forms

The members of which class of the phylum Cnidaria occur only as polyps?

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#Question id: 8863

#Unit 9. Diversity of Life Forms

Which class of the phylum Cnidaria includes ʺjelliesʺ with rounded (as opposed to boxlike) medusae? 

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#Question id: 8864

#Unit 9. Diversity of Life Forms

Corals are most closely related to which group?

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#Question id: 8886

#Unit 9. Diversity of Life Forms

Which characteristic is shared by both cnidarians and flatworms?