This occurs when there is a problem with controlling how cells divide and replace themselves.
A. crossing over
B. nondisjunction
C. cancer
D. death
C. cancer
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Prokaryotic cell walls consist of a network of polysaccharide molecules connected by cross-bridges of
A. other polysaccharides. B. lipids. C. peptides. D. ribosomes. E. chromosomal DNA.
What criteria can be used to identify species? Select all that apply.
_____ The ability to interbreed _____ Molecular similarity _____ Ecological factors _____ Evolutionary relationships
Which of the following is not a common cause of mutation?
A. exposure to chemical substances B. events of meiosis C. errors in replication D. obesity E. exposure to radiation
Emil von Behring and Shibasaburo Kitasato demonstrated the body's defense mechanism against disease known as
A. Humoral immunity (antibody mediated) B. Cell-mediated immunity C. Both humoral immunity and cell-mediated immunity D. Neither humoral immunity nor cell-mediated immunity