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
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Which of the following is not produced in the
light dependent reactions? a. glucose. b. oxygen. c. ATP. d. NADPH. e. all of these are produced
Skin is able to prevent most microorganisms from entering the body by
A) producing alkaline secretions. B) having keratin in the uppermost layer. C) production of antibodies. D) the adhesion junction in the skin preventing bacteria from entering. E) releasing macrophages on the skin surface.
Variation among pre-cells was due to ________
A) genetic drift B) natural selection C) the bottleneck effect D) mutation
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
A. chromatophores. B. lophophores. C. trochophores. D. spermatophores. E. phytophores.