← CH 5 Microbiology Test
5 Written Questions
5 Matching Questions
- a A microbe that grows and lives in the absence of oxygen.
- b A relationship in which both organisms benefit. For example, certain normal flora living in the human intestine synthesize vitamin K, biotin, riboflavin, pantothenate, and pyridoxine.
- c A network of filaments or strands in mushrooms.
- d Short bacilli that are thick and somewhat ovoid.
- e Any of several small intracellular parasites of the genus Rickettsia that require a vector (such as fleas, ticks, or lice) to spread disease.
5 Multiple Choice Questions
- Single-celled microscopic eukaryotes that produce vitamins and proteins.
- Infectious agents that are even simpler in nature than bacteria. They are usually not considered cellular. Viruses are composed of a small amount of DNA or RNA wrapped in a protein covering. A virus is visible only with an electron microscope.
- An organism that obtains its nutrients from dead organic matter. Many bacteria and fungi are saprophytes.
- A potent toxin that is secreted or excreted by living microorganisms as the result of bacterial metabolism. Exotoxins are the most poisonous substances known to human beings. Bacteria of the genus Clostridium are the most frequent producers of exotoxins.
- The ability to live in two different forms, such as the few fungi, usually pathogens, that can live either as molds or as yeasts depending on growth conditions.
5 True/False Questions
Photosynthesis: → Organisms that use light as a source of energy.
Intermediate organisms: → The number of organisms required to cause a disease in a susceptible host.
Binary fission: → Also called simple fission, the common form of asexual reproduction of bacteria in which each bacterium splits into two similar cells.
Candida albicans: → A type of pathogenic yeast that is dimorphous.
Chemotrophs: → Organisms that use chemical substances as a source of energy.