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
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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.
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
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).
Primary infertility is diagnosed when a couple who has had one child has trouble conceiving a second
a. True b. False