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Microbiology Questions and Answers (Q&A)

Correct answer to this question is option D
A microorganism is an organism that is microscopic; this means such organism cannot be seen with the naked eye. Microorganism includes bacteria, fungi, viruses, protists, and archaea.

Many organisms serve as a source of antibiotics, for example penicillum produced the first discovered antibiotics. Streptomyces sp. produces the aminoglycoside antibiotics.

Nonpathogenic microorganisms are often used in the production of fermented food such as – yoghurt, cheese, bread, and wine.

Many microorganisms feed upon dead organic materials and help decompose them.

However, not all microorganisms are harmful to the human body; in fact, there are many microorganisms in the human body that help in the normal functioning in the human body.

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It's option C. All have a protein capsid and envelope. Not all viruses have a protein capsid and envelope.

Viruses are basically microscopic parasites which don't have the capacity to thrive and reproduce outside of a host body. They may have DNA, RNA, Single, or Double-stranded and they are obligate intracellular parasites. And of course, they release virions during cell lysis or budding. Here, all the options are true in regards to viruses except option C.

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Among those options given non is correct regarding Clostridium species because,they are gram positive rods,anaerobic, endospore formers.

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The correct answer to this question is PYR Positive. PYR stands for pyrrolidonly Aminopeptidase. This test is used to detect the activity of pyrolidonly arylamidase activity. This activity appears in Streptococcus pyogenes (also known as Group A strep), Enterobacteriaceoa, and Enterococcus. It can also be used to identify E. Coli.

Using the broth method, the PYR test takes about 4 hours and the disk method takes about 10 to 15 minutes. As shown in this image, it is positive because a cherry red color has developed. If the result was negative, the test would be a yellow or orange color.

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Louis Pasteur disproved that life arises from non-living things which are known as spontaneous generation. He performed an experiment using a swan neck flask to confirm that life does not come from non-living things. He found out that life, in fact, comes from previously existing organisms known as biogenesis. For example, if you leave a slice of raw meat on a table for a long period of time, it is the bacteria present in the meat and also the microorganisms present in the air that will cause the meat to rot and decay. It is this theory that is currently accepted : )

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1. Microorganisms are found in all of the above places

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The correct answer to this question is B. A Gram stain, or Gram's method, is a technique for identifying two types of bacteria created by scientist Hans Christian Gram in 1884 in Berlin. First, a violet dye is applied, and then a decolorizing agent is applied.

Finally, a red dye is applied. The cell walls of the bacteria retain either the first blue dye (G+) or they retain the red dye (G-). This technique helps scientists quickly separate bacteria into two groups to quickly learn more about their cellular compositions. G+ bacteria have a thicker outer layer than G- bacteria.

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Fix the grammar, cells should be accepted as the right answer

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The correct answer to this question is C, Obligate aerobe. A Facultative anaerobe is a microorganism. Being that they can metabolize energy aerobically or anaerobically, they can grow with or without oxygen. Therefore, a student preventing oxygen flow into the tube wouldn't affect it because it can improve without it.

Oxygen is harmful to Strict anaerobes, so the oxygen is kept out is suitable for these organisms. That leaves Obligate aerobe. This organism requires energy to grow. A student closing the tube would kill the body, which is why Obligate aerobe is the correct answer.

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