Viruses are lifelike structures that have characteristics of living cells with the exception of _______________.
A. a requirement for a host cell for replication
B. nucleic acid transcription
C. nucleic acid to transmit viral characteristics
D. structural proteins
A. a requirement for a host cell for replication
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The duplication of homeotic (Hox) genes has been significant in the evolution of animals because it _____
A) permitted the evolution of novel forms B) caused the extinction of major groups C) reduced morphological diversity into simpler forms of life D) allowed animals to survive on significantly fewer calories
Which of the following would be considered a
carrier of a sex-linked recessive defect?
a. a man with the defect b. a woman with the defect c. a father of a son with the defect d. the normal daughter whose father had the defect e. a son of two unaffected parents
Secondary endosymbiosis can occur when a
A) nonphotosynthetic protist engulfs a photosynthetic bacterium. B) virus infects a photosynthetic prokaryote. C) protist evolves to become a prokaryote. D) nonphotosynthetic protist engulfs a photosynthetic protist. E) green alga engulfs a photosynthetic bacterium.
Please match the viral diagnostic method to its description. Used to cultivate viruses and observe cytopathic effects on host cells
A) PCR B) Immunological testing C) Electron microscopy D) Cell and tissue culture techniques E) Observation of the patient