Which of the following is not found in all viruses?

a. nucleic acid
b. protein coat
c. envelope
d. all of these are found in all viruses


Ans: c. envelope

Biology & Microbiology

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The primary disadvantage of an osmoregulator strategy is

A. pumping ions into or out of the body is energetically expensive. B. pumping ions into or out of the body is not a significant energetic expense usually. C. keeping relatively constant internal conditions deprives the central nervous system of critical information about the environment. D. pumping water into or out of the body is energetically expensive. E. physiological systems do not typically perform well under relatively constant conditions.

Biology & Microbiology

A bronchoscopy was performed on a patient who later developed a nosocomial infection as a result of the procedure. The organism recovered from his lung was a nonlactose fermenter that oxidized glucose and maltose, was lysine decarboxylase–positive, and was motile. The organism is most likely which one of the following?

a. Bordetella parapertussis b. Saccharolytic Acinetobacter c. P. luteola d. S. maltophilia

Biology & Microbiology

Dideoxy nucleotides are used in which of the following processes?

A. Microarray analysis.B. Transformation. C. PCR. D. making a recombinant plasmid. E. DNA sequencing.

Biology & Microbiology

Biological magnification refers to __________ at the

higher trophic levels. a. the larger size of animals b. the greater number of organisms c. the greater number of species d. the accumulation of toxic pollutants in animals e. all of these

Biology & Microbiology