Several hypotheses have been proposed to explain the evolutionary origin of viruses. Which of the following does NOT assume that viruses evolved from living cells?
A. Viruses evolved from macromolecules-lipids, proteins, nucleic acids, and carbohydrates.
B. Viruses evolved from chromosomal elements.
C. Viruses evolved from plasmids that acquired genes for their own replication.
D. The precursors of DNA genomes may have been self-replicating RNA molecules.
E. Viruses evolved by losing all the genetic information that is not absolutely required for reproduction.
Answer: D
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An inflammation-causing signal released by mast cells at the site of an infection is _____
A) an interferon B) lymphatic fluid C) histamine D) mucus E) sodium ions
Which is true of MRSA strains?
A. They are all resistant to vancomycin. B. They carry the R plasmid. C. They may be susceptible to linezolid. D. The carry the R plasmid AND they may be susceptible to linezolid.
Members of this Ecdysozoan phylum include many important decomposers, but also many damaging
parasites. Many parasitize the roots of plants, while others cause disease in animals. More than 1 billion people worldwide are estimated to be infected by members of this group such as pinworms, trichinas, and filarial worms.
a. Arthropoda b. Onychophora c. Nemertea d. Annelida e. Nematoda
In the diagram below, the monomer that serves as the subunit to creating this organic molecule category is called
a. nucleotide. b. sugar. c. base. d. glucose. e. phosphate.