An airborne chemical that is used to communicate with members of the same species is called a ____
Fill in the blank with the appropriate word.
pheromone
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In which of the following areas of the human body do secretions play the greatest role in preventing microbial colonization?
A. Genital tract B. Stomach C. Large intestine D. Upper respiratory tract
In a certain population, 40 of every 1,000 births results in an individual that suffers from cystic
fibrosis. What is the allele frequency for the recessive allele that causes cystic fibrosis? a. 0.004 b. 0.02 c. 0.2 d. 0.4 e. 0.8
Bacterial ____ cause systemic symptoms such as fever, whereas bacterial ____ cause more specific maladies
a. phages; prophages b. prophages; phages c. exotoxins; phages d. exotoxins; endotoxins e. endotoxins; exotoxins
Massive _____ changes have occurred over time as a result of continental drift, leading in many cases to mass extinction of various species.
What will be an ideal response?