Tuberculosis (TB) Is Caused by the Acid-Fast Bacterium Mycobacterium Tuberculosis

question 10

Multiple Choice

Tuberculosis (TB) is caused by the acid-fast bacterium Mycobacterium tuberculosis. Although most TB cases affect the lungs (pulmonary TB) , some infections occur in other body sites (extrapulmonary TB) . Among these cases, lymph node tuberculosis (LNTB) is the most common. Diagnosis of LNTB by conventional methods (staining, biochemical tests) has limitations—for example, formaldehyde preservation of tissue biopsies interferes with the acid-fast stain, leading to underdiagnosis or misdiagnosis. Now fluorescent in situ hybridization (FISH) is being used to diagnose extrapulmonary TB.


-When a tissue sample such as lymph node tissue is to be analyzed by FISH, it must first be treated with chemicals. Which of the following is NOT a reason that this step is needed?

• A) To maintain cell shape.
• B) To inactivate enzymes that might otherwise degrade the nucleic acid of the cells.
• C) To make the cells more permeable so that the labeled probe can easily enter.
• D) To inactivate enzymes that might otherwise degrade the nucleic acid of the cells AND to maintain cell shape.
• E) To break down the cellulose walls of the tissue so that the probes can enter those cells. 

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Definitions:

Frequency Distribution

A mathematical function showing the number of instances in which a variable attains each of its possible values.

Histogram

A diagram that presents the grouped data from a frequency table.

Frequency Distribution

This represents the way in which data is divided or distributed across different possible values or ranges, typically shown in a table or graph.

Angela's Meat & Poultry

A fictional or actual establishment involved in the processing or selling of meat and poultry items, possibly named after its founder or owner, Angela.