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Chapter 23, Problem 10MC
Summary Introduction

Introduction:

Cows consume a lot of cellulose-rich food, which is hard to digest.

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Which of the following statements is incorrect? a. Mucosal surfaces are better than skin surfaces at supporting colonization by commensal microorganisms. b. The skin provides a larger surface area than mucosal surfaces for commensal microorganisms. c. There are ten times as many bacteria residing in the intestinal tract than the number of cells in the human body. d. It is common for commensal bacteria to live in symbiosis with their human hosts. e. During gestation in mammals, a fetus does not have any commensal microorganisms on their skin or mucosal surfaces.
An infectious dose of several million cells in enteric infections seems like a lot. a. In terms of the size and abundance of microbes, could you see a cluster containing that many cells with the naked eye? b. About how long would it take an average bacterial species to reach the infectious dose of a million cells starting from a single cell? c. Why do enteric diseases require a relatively higher infectious dose than nonenteric diseases? d. Explain why antimicrobic therapy used on gram-negative bacterial infections could actually lead to illness rather than cure it
The working part of the muscle is called   A. Head   B. Belly   C. Tendon   D. Aponeurosis What are the microbes called which colonize our bodies and actually help us to survive by aiding digestion or guarding against infection.   pathogens   normal flora   vectors   fomites
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