Chapter 6 And 7
Quiz on Chapter 6: Viruses
and on
Chapter 7: Elements of micobial nutrition, ecology and growth
Questions and Answers
- 1.
Who postulated that rabies was caused by a Virus?
- A.
Antoni van Leeuwenhoek
- B.
Louis Pasteur
- C.
John Tyndall
- D.
Ferdinand Cohn
Correct Answer
B. Louis PasteurExplanation
Louis Pasteur is credited with postulating that rabies was caused by a virus. Pasteur conducted extensive research on rabies and made significant contributions to understanding the disease. He developed a vaccine for rabies and successfully tested it on animals, which led to the prevention and treatment of this deadly infection. Pasteur's work on rabies and other diseases laid the foundation for the field of microbiology and revolutionized our understanding of infectious diseases.Rate this question:
-
- 2.
_____ must be probvided to an organism.
Correct Answer
essential nutrientsExplanation
Essential nutrients are necessary for the proper functioning and survival of an organism. These nutrients cannot be synthesized by the organism itself and must be obtained from external sources, such as food or the environment. Without these essential nutrients, the organism may experience deficiencies that can lead to various health problems or even death. Therefore, the provision of essential nutrients is crucial for the well-being and sustenance of an organism.Rate this question:
- 3.
Misfolded proteins, contain no nucleic acid.
- A.
Prions
- B.
Oncoviruses
- C.
Lysis
- D.
Capsid
Correct Answer
A. PrionsExplanation
Prions are misfolded proteins that do not contain nucleic acid. Unlike viruses, which have nucleic acid (DNA or RNA) surrounded by a protein coat called a capsid, prions consist solely of abnormal proteins. Prions are known to cause various neurodegenerative diseases, such as Creutzfeldt-Jakob disease and mad cow disease, by inducing other normal proteins to adopt the misfolded conformation. Therefore, prions are a unique class of infectious agents that can propagate without the need for genetic material.Rate this question:
-
- 4.
96% of the cell is composed of these elements:-Carbon-Hydrogen-Oxygen-Phosphorous-Sulfur and
- A.
Magnesium
- B.
Potassium
- C.
Nitrogen
- D.
Zinc
Correct Answer
C. NitrogenExplanation
Nitrogen is the correct answer because it is one of the elements that make up 96% of the cell. The question states that the cell is composed of carbon, hydrogen, oxygen, phosphorous, sulfur, magnesium, potassium, nitrogen, and zinc. However, the other elements mentioned (magnesium, potassium, and zinc) are not part of the 96% composition, while nitrogen is included in the list of elements that make up the majority of the cell.Rate this question:
-
- 5.
Viruses bear no resemblance to cells?
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Lack protein synthesizing machinery.Rate this question:
-
- 6.
________, a kind of chemoautotroph, produce methane gas under anaerobic conditions.
Correct Answer
MethanogensExplanation
Methanogens are a type of chemoautotroph that can produce methane gas in the absence of oxygen. Chemoautotrophs are organisms that obtain energy by oxidizing inorganic compounds, such as hydrogen gas, and use this energy to convert carbon dioxide into organic molecules. Methanogens are unique in their ability to produce methane as a byproduct of their metabolic processes. They are commonly found in environments such as swamps, marshes, and the digestive tracts of animals, where anaerobic conditions prevail. Methanogens play a crucial role in the global carbon cycle by contributing to the production of methane, a potent greenhouse gas.Rate this question:
- 7.
______ are protein coats that enclose and protect their nucleic acid.
Correct Answer
CaspidsExplanation
Caspids are protein coats that enclose and protect their nucleic acid.Rate this question:
- 8.
Chemoautotrophs (lithoautotrophs) survive totally on organic substances.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
they survive on inorganic substances.Rate this question:
-
Quiz Review Timeline +
Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.
-
Current Version
-
Mar 20, 2023Quiz Edited by
ProProfs Editorial Team -
Dec 12, 2010Quiz Created by
Staysea993
Back to top