Which of the following bacterial cell structures plays an important role in the creation of biofilms?

A. glycocalyces
B. flagella
C. fimbriae
D. pili
E. both fimbriae and glycocalyces


Answer: E

Biology & Microbiology

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Natural selection

A. is evolution. B. is a key mechanism that causes evolution to happen. C. occurs at the population level. D. results in reproductive success. E. occurs at the population level and is a key mechanism that causes evolution to happen.

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If a pedigree of several generations shows only females affected by a particular trait, it cannot be a(n) ____ trait

a. autosomal recessive
b. autosomal dominant
c. Y-linked
d. X-linked recessive
e. X-linked dominant

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Membrane-like structures form when proteins or lipids are mixed with water. They serve as a model

for __________, which may have preceded cells. Fill in the blank(s) with the appropriate word(s).

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Primary infertility is diagnosed when a couple who has had one child has trouble conceiving a second

a. True b. False

Biology & Microbiology