Which of the following staphylococcal virulence factors produce the signs and symptoms of scalded skin syndrome?
A. hyaluronidase
B. staphylokinase
C. exfoliative toxin
D. leukocidin
E. coagulase
Answer: C
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Which of the following are arranged in the sequence in which the various taxa first appeared in time?
A. bacteria, protists, charophyceans, liverworts, lycophytes, gnetophytes, angiosperms B. Archaea, protists, charophyceans, mosses, ferns, conifers, flowering plants C. bacteria, protists, charophyceans, mosses, cycads, angiosperms D. prokaryotes, protists, charophyceans, mosses, ferns, conifers, flowering plants E. All the other choices provided are correct
During endocytosis, if a bacterial cell is not degraded and bacterial DNA is taken up by the eukaryotic cell, what may have occurred?
A. vertical evolution. B. horizontal gene transfer. C. vertical exon shuffling. D. chromosomal duplication and genomic exchange. E. both chromosomal duplication and vertical evolution.
What is a segment of DNA that can use transposase to move from one place in the genome to another called?
A) regulatory region B) duplication C) translocation D) DNA transposition E) retrospection
Describe why increasing depth in lakes leads to succession of microbes that have different modes of respiration. How are electron receptors other than oxygen involved?
What will be an ideal response?