Biology
Biology
3rd Edition
ISBN: 9781259824913
Author: Hoefnagels, Mariëlle
Publisher: Mcgraw-hill Education,
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Chapter 29.4, Problem 3MC
Summary Introduction

To determine:

The reason for the inability of scientists to produce vaccine against HIV and common cold.

Introduction:

Many organisms attack other organisms and cause infectious diseases. All organisms have a well-defined organ system that fights with these pathogens and protect the body from infectious diseases. This organ system is called the immune system. The scientists have discovered a technique in which microbes are used to enhance the immune system. This method is termed as vaccination. The substance that contains weak or attenuated form of microbes to enhance the activity of immune system is termed as vaccine.

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foraging/diet type teeth tongue stomach intestines cecum Insectivory numerous, spiky, incisors procumbentExample: moleExample: shrew -- simple short mostly lacking Myrmecophagy absent or reduced in numbers, peg-likeExample: tamandua anteater extremely long simple, often roughened short small or lacking Terrestrial carnivory sharp incisors; long, conical canines; often carnassial cheek teeth; may have crushing molarsExample: dog -- simple short small Aquatic carnivory homodont, spiky, numerousExample: common dolphin -- simple or multichambered (cetaceans only) variable small or absent Sanguinivory very sharp upper incisors; reduced cheek teethExample: vampire bat grooved tubular, highly extensible long small or lacking Herbivory (except nectivores) incisors robust or absent; canines reduced or absent; diastema; cheek teeth enlarged with complex occlusal surfacesExample: beaver -- simple (hindgut fermenters) or multichambered (ruminants) long large Filter feeding none…
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