In a Recent Research Article Describing the Use of FISH

question 15

Multiple Choice

In a recent research article describing the use of FISH to detect LNTB, the authors noted that they used probes that were only 20 base pairs (bp) in length rather than the conventional 100 bp-500 bp. Given what you know about acid-fast bacteria, why do you think they took this approach?

• A) The nature of the Mycobacterial cytoplasmic membrane likely makes is difficult for larger probes to enter the cell.
• B) The nature of the Mycobacterial capsule likely makes is difficult for larger probes to enter the cell.
• C) The nature of the Mycobacterial cell wall likely makes is difficult for larger probes to enter the cell.
• D) Mycobacteria have a lipopolysaccharide outer membrane through which larger probes cannot enter.
• E) Mycobacteria have smaller ribosomes than any other bacteria and the probes are targeted at rRNA.

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Definitions:

Fovea

The fovea is a small, central pit composed of closely packed cones in the eye, responsible for sharp central vision necessary for activities like reading and driving.

Iris

The colored part of the eye surrounding the pupil, which adjusts the size of the pupil to regulate the amount of light entering the eye.

Pupil

The central, circular opening in the iris of the eye, which regulates the amount of light that enters the eye to reach the retina.

Iris

The colored part of the eye surrounding the pupil, responsible for controlling the diameter and size of the pupil and thus the amount of light reaching the retina.