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DHA Medical Laboratory Technologist (DHA-MLT) Practice Questions and Tests - Review


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DHA Medical Laboratory Technologist - Reviews


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Exam Edge is an industry leader in online test prep. We work with institutional partners to offer a wide array of practice tests that will help you prepare for your big exam. No matter how niche your field of interest might be, we're here to help you prepare for test day.

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DHA Medical Laboratory Technologist - Test Reviews Sample Questions

Which of the below statements is true about paraffin wax?

Correct Answer:
different paraffins can be melted at different melting points.


the true statement about paraffin wax from the options provided is: "different paraffins can be melted at different melting points." this statement is accurate as paraffin wax, a petroleum by-product created when crude oil is refined, comes in various forms, each with unique properties including different melting points. these variations in melting points are due to differences in the molecular structure and the length of the hydrocarbon chains within the paraffin wax. typically, the melting point of paraffin wax ranges from about 37°c to 60°c, although specialized formulations may exist outside this range.

the statement "paraffin can only be frozen, not melted." is incorrect. paraffin wax, like many waxes, can be both melted and solidified. it is commonly used in candles, where it melts as it burns, and in various industrial applications where it is essential for the wax to be in both solid and liquid states at different times.

the assertion that "paraffin does not work well with tissue." is also not universally true. paraffin wax is extensively used in histology laboratories for tissue embedding, which is critical in the preparation of tissue samples for microscopic examination. it provides a medium that adequately supports tissue structure allowing for very thin sections to be cut for detailed study. the wax's properties help preserve the morphology and structure of biological tissues, thus it is considered to work well with tissue in this context.

finally, the claim that "all paraffins are the same." is false. as previously mentioned, paraffin wax varies in its chemical composition and properties, including differing melting points, hardness, and flexibility. these differences make certain types of paraffin wax more suitable for specific applications than others. for example, softer waxes with lower melting points may be preferred for candle making, while harder waxes with higher melting points could be chosen for creating more durable forms and coatings.

in conclusion, understanding the varying properties of different types of paraffin wax is crucial for selecting the right type for specific applications, whether it be in industrial uses, in candle making, or in scientific settings such as tissue processing in histology.

What is used to color transparent sections of tissue?

Correct Answer:
staining.


the correct answer to what is used to color transparent sections of tissue is "staining." staining is a critical technique in both clinical and biological research that involves applying stains or dyes to tissues. this process is essential because many tissue components are nearly transparent under a microscope, and staining helps to differentiate them by adding color, thereby enhancing the contrast between different elements within the tissue.

staining allows pathologists and researchers to observe the structure of tissues and the presence of specific cell types under a microscope. this is crucial in diagnosing diseases, conducting scientific research, and understanding the complex interactions within tissues. for example, in clinical pathology, staining helps identify abnormal or malignant cells in biopsy samples, which is vital for accurate diagnosis and treatment planning.

one of the most common staining techniques used in histology is the hematoxylin and eosin stain, commonly referred to as h&e staining. hematoxylin colors the nuclei of cells blue, while eosin colors the cytoplasm and extracellular matrix in various shades of pink and red. this staining method is routinely used because it provides a good general view of the tissue structure.

besides h&e, there are numerous other staining techniques designed to highlight specific tissue components or chemical elements within cells. for instance, immunohistochemistry uses antibodies linked to a dye to detect particular proteins within tissues, while special stains like pas (periodic acid-schiff) highlight polysaccharides and mucosubstances in tissues.

in conclusion, staining is indispensable in the fields of histology and pathology as it provides the necessary contrast to examine the microscopic details of tissues, thereby aiding in medical diagnoses and biological research.