EBK BROCK BIOLOGY OF MICROORGANISMS
EBK BROCK BIOLOGY OF MICROORGANISMS
15th Edition
ISBN: 8220103633352
Author: Stahl
Publisher: PEARSON
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Chapter 24.3, Problem 1MQ
Summary Introduction

The oral cavity provides a variety of microbial habitats. It is because the oral cavity consists of mucous membrane which supports the growth of normal microbiota and prevents the infection by pathogenic microorganisms. These membranes secrete mucin, which retains moisture and inhibits the microbial attachment of pathogens. The invading microbes are swept away by physical processes like swallowing and sneezing.

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Q8. A researcher wants to study the effectiveness of a pill intended to reduce stomach heartburn in pregnant women. The researcher chooses randomly 400 women to participate in this experiment for 9 months of their pregnancy period. They all need to have the same diet. The researcher designs two groups of 200 participants: One group take the real medication intended to reduce heartburn, while the other group take placebo medication. In this study what are: Independent variable: Dependent variable: Control variable: Experimental group: " Control group: If the participants do not know who is consuming the real pills and who is consuming the sugar pills. This study is It happens that 40% of the participants do not find the treatment helpful and drop out after 6 months. The researcher throws out the data from subjects that drop out. What type of bias is there in this study? If the company who makes the medication funds this research, what type of bias might exist in this research work?
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