The primary effect of lactobacilli in the adult vagina is to

A. maintain an acidic environment
B. keep the menstrual cycle regular
C. maintain an alkaline environment
D. produce a protective mucus layer
E. increase fertility


Ans: A. maintain an acidic environment

Biology & Microbiology

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Variation among pre-cells was due to ________

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You and your biology lab class take a field trip to a marine aquarium. Your guide is a marine biologist who studies squids. She explains to your class how squids are able to blend into their environment. She points out that squids have pouches of pigments embedded in their epithelium. The pouches are called

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