Campbell Essential Biology with Physiology (5th Edition)
Campbell Essential Biology with Physiology (5th Edition)
5th Edition
ISBN: 9780321967671
Author: Eric J. Simon, Jean L. Dickey, Jane B. Reece, Kelly A. Hogan
Publisher: PEARSON
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Chapter 22, Problem 1SQ
Summary Introduction

To explain: Why it is unlikely that a newly discovered large animal has no alimentary canal and relies only on food vacuoles.

Introduction: Food vacuoles are cellular organelles in which hydrolytic enzymes breakdown food. Alimentary canal is a tube-like structure that is a gastro-vascular cavity in the animal with complex body plans. The food moves in a single direction in the alimentary canal that can be organized into specialized compartments.

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Food vacuoles are modest digestive compartments. The hydrolysis of food materials inside the vacuoles is called intracellular digestion. This begins when a cell ingests the solid food by phagocytosis or liquid food by pinocytosis. The food vacuoles join with lysosomes that contain hydrolytic enzymes. This allows the digestion safely in a protective compartment with hydrolytic enzymes. As the new large species discovered rely on food vacuole instead of alimentary canal for the food digestion, large food cannot be digested by the food vacuole. It would be difficult for the animal to eliminate the waste. The animal would not be able to nourish many cells from which they are composed.

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