Microbiology Quizzes Online & Trivia

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.

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.  

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

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.

1. Microorganisms are found in all of the above places

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.

  Then the capsid is composed of capsomere are the repaeting unit ,probaply b is no correct since assembage require the host material intervention.

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

WRONG! Haemophilus influenzae will grow around XV, whereas H. parainfluenza will grow around V and XV

PATHOGENS IS A CORRECT ANSWER TOO!!!!!!!

CELLS are the fundamental unit of all living things.

The concept of transition mutation is very vital to genetic biology. In the field of genetics, the transition point is the one that changes the purine nucleotide into another purine nucleotide (or a pyrimidine nucleotide into another pyrimidine nucleotide). There are different reasons why this transitions might be caused. The most commonly known reason is that transitions are caused due to the oxidative deamination. Having made that clear, the chemical 5-Methylcytosine is far more likely to make a transition in comparison to unmethylated cytosine. This is probably due to a deamination that is spontaneous and occurs without a definite pattern/time.