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



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DHA Medical Laboratory Technologist - Additional Information

At ExamEdge.com, we focus on making our clients' career dreams come true by offering world-class practice tests designed to cover the same topics and content areas tested on the actual Dubai Health Authority DHA Medical Laboratory Technologist (LABTO) Certification Exam. Our comprehensive DHA Medical Laboratory Technologist practice tests are designed to mimic the actual exam. You will gain an understanding of the types of questions and information you will encounter when you take your Dubai Health Authority DHA Medical Laboratory Technologist Certification Exam. Our DHA Medical Laboratory Technologist Practice Tests allow you to review your answers and identify areas of improvement so you will be fully prepared for the upcoming exam and walk out of the test feeling confident in your results.

Because our practice tests are web-based, there is no software to install and no need to wait for a shipment to arrive to start studying. Your DHA Medical Laboratory Technologist practice tests are available to you anytime from anywhere on any device, allowing you to study when it works best for you. There are 20 practice tests available, each with 100 questions and detailed explanations to help you study. Every exam is designed to cover all of the aspects of the DHA MLT exam, ensuring you have the knowledge you need to be successful!

DHA Medical Laboratory Technologist - Additional Info Sample Questions

Which of the following is NOT a general characteristic of the Clostridium genus of anaerobic gram positive spore-forming bacilli?

Correct Answer:
catalase positive
to understand why "catalase positive" is the correct answer to the question about what is not a general characteristic of the clostridium genus, it’s important to delve a bit deeper into microbiological properties and classifications of bacteria.

clostridium is a genus of bacteria that is well-known in the field of microbiology for several defining characteristics. primarily, these bacteria are obligate anaerobes, meaning they can only grow in environments where oxygen is absent. they are also gram-positive, which refers to their ability to retain the crystal violet stain used in the gram staining method, indicating a thicker peptidoglycan layer in their cell walls.

another critical characteristic of clostridium species is their ability to form spores. spore formation is a survival mechanism that allows the bacteria to withstand harsh environmental conditions, including the presence of oxygen, which they generally cannot tolerate in their active form. these spores can remain dormant but viable for years, and become active again when conditions are favorable.

regarding the catalase enzyme, which is where the question focuses, clostridium species are generally catalase negative. the catalase enzyme breaks down hydrogen peroxide into water and oxygen, a reaction that is visible as bubbling when hydrogen peroxide is applied to catalase-positive organisms. since clostridium are anaerobes, the presence of oxygen is detrimental to them, and hence, they typically do not produce catalase. this characteristic helps in differentiating clostridium from some other genera of bacteria, such as staphylococcus, which are usually catalase positive.

the presence of catalase in bacteria is thus a crucial diagnostic tool used in microbiology to help identify and classify bacteria. by stating that clostridium is "catalase positive," one would be incorrectly assigning a characteristic generally associated with aerobes (oxygen-utilizing organisms) or facultative anaerobes (organisms that can survive in both the presence and absence of oxygen). therefore, the statement "catalase positive" is not accurate for the clostridium genus and is rightly identified as a non-characteristic of these bacteria.