All of the following infectious microorganisms are thought to contribute to cancer EXCEPT which one?
A) E. coli
B) Epstein-Barr virus
C) human papillomavirus
D) Helicobacter pylori
E) hepatitis B virus
A
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An important mineral ion that is a component of chlorophyll and serves as a stabilizer of membranes and ribosomes is ________.
A. calcium B. magnesium C. zinc D. potassium E. iron
In which of the following is the presence of different mating types critical to sexual reproduction?
A. Sporangiospore-producing species B. Heterothallic species C. Homothallic species D. Arthrospore-producing species
Small single strand DNA molecules with a fluorescent molecule attached that are used to identify a clone containing a specific gene fragment is called a
A) primer. B) probe. C) plasmid. D) promoter. E) peptide.
Human herpesvirus 6 (HHV-6) has the following characteristics, except
A. it causes Kaposi's sarcoma. B. it replicates in T lymphocytes, macrophages, and salivary gland tissue. C. it appears as a mononucleosis-like illness in adults. D. it causes roseola in infants. E. it is transmitted by saliva.