When a fragment breaks from a chromosome and rejoins it, in a flipped orientation, the result is called a/an:
A) polyploidy.
B) aneuploidy.
C) translocation.
D) deletion.
E) inversion.
Answer: E
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A patient specimen was Gram-stained upon arrival in the clinical laboratory and revealed both Gram-positive cocci and Gram-negative bacilli. The specimen was cultured on sheep blood agar and chocolate agar, and after incubation, the culture grew only the Gram-negative bacilli. Which of the following is/are a likely explanation(s) for the failure of the Gram-positive cocci to grow?
A. The Gram-negative bacilli may have grown very quickly and overgrew the slower growing Gram-positive cocci. B. The growth temperature may have enabled the growth of the Gram-negative bacilli but not the growth of the Gram-positive cocci. C. The Gram-positive cocci may be an obligate anaerobe and was unable to grow in an ambient air incubator. D. The media used may not support the growth of the Gram-positive cocci. E. All of the choices are possible explanations.
Which is the most frequently chosen prokaryotic host for use in cloning techniques?
A. Staphylococcus aureus B. Bacillus subtilis C. Escherichia coli D. Saccharomyces cerevisiae
Hawks that eat field mice are practicing mutualism
Indicate whether the statement is true or false
All of the following are correct about iodophors, except
A. this formulation allows a quick release of free iodine. B. this formulation increases its penetration. C. they are complexes of iodine and a neutral polymer. D. a common iodophor is Betadine. E. it is less prone to staining or irritating tissue.