WHAT IS LIFE? A GUIDE TO BIO 3E+LAUNCHPA
WHAT IS LIFE? A GUIDE TO BIO 3E+LAUNCHPA
3rd Edition
ISBN: 9781319103316
Author: PHELAN
Publisher: Macmillan Higher Education
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Chapter 22, Problem 13SA
Summary Introduction

To analyze:

How mammals that don't have enzymes for the digestion of cellulose are able to extract nutrients from foods that contain cellulose.

Introduction:

Various bacteria live in the digestive organs of animals that consume cellulose-rich foods.

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When young rats are placed on a completely fat-free diet, they grow poorly, develop a scaly dermatitis, lose hair, and soon die. These symptoms can be prevented if linoleate or plant material is included in the diet. What makes linoleate an essential fatty acid? Animals lack the enzymes required to synthesize long-chain fatty acids with 14 or more carbons. Animals lack the enzymes required to synthesize odd-number fatty acids. Animals lack the enzymes required to synthesize polyunsaturated fatty acids. Animals lack the enzymes required to introduce double bonds into fatty acids beyond the A9 position.
One example of a stage 1 reaction in the heterotrophic breakdown of food molecules is: the intramitochondrial digestion of pyruvate into carbon dioxide and water the intramitochondrial digestion of fatty acids into carbon dioxide and water the extracellular digestion of triglycerides into fatty acids and glycerol the intracellular digestion of some amino acids into NH4+ and pyruvate the intracellular digestion of glucose monomers into pyruvate
One example of a stage 3 reaction in the heterotrophic breakdown of food molecules is: the intramitochondrial digestion of fatty acids into carbon dioxide and water the intracellular digestion of glucose monomers into pyruvate the intracellular digestion of some amino acids into NH4+ and pyruvate the extracellular digestion of polypeptides into amino acids the extracellular digestion of triglycerides into fatty acids and glycerol
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