Prokaryotic cell walls consist of a network of polysaccharide molecules connected by cross-bridges of
A. ribosomes.
B. lipids.
C. other polysaccharides.
D. chromosomal DNA.
E. peptides.
Answer: E
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Most North American outbreaks of Cyclospora cayetanensis have been associated with
A. cattle. B. iguanas. C. imported leafy vegetables and berries. D. chickens.
FAD and cytochromes are classified as:
a. hydrogen or electron acceptors. b. phosphate oxidizers. c. phosphate reducers. d. proteins that donate hydrogens or electrons. e. redox intermediate catalysts.
Translocation occurs when:a
part of a chromosome breaks off and attaches to a nonhomologous chromosome. b. part of a chromosome breaks off and attaches to a homologous chromosome. c. crossing-over events occur. d. genes move from one area on a chromosome to another area on the same chromosome. e. a Y chromosome replaces an X chromosome in a female cell.
Proteins of the _______ family link transmembrane proteins of the tight junction to actin.
a. catenin b. plakin c. plectin d. zonula occludens