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

Biology & Microbiology

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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.

Biology & Microbiology

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

Biology & Microbiology

Hawks that eat field mice are practicing mutualism

Indicate whether the statement is true or false

Biology & Microbiology

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.

Biology & Microbiology