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Biology Module 2
Study Guide
Question | Answer |
---|---|
Pathogen | An organism that causes disease. |
Saprophyte | An organism that feeds on dead matter. |
Parasite | An organism that feeds on a living host. |
Aerobic | An organism that requires oxygen. |
Anaerobic | An organism that does not require oxygen. |
Steady State | A state in which members of a population die as quickly as new members are born. |
Exponential growth | population growth that is unhindered because of the abundance of resources for an ever increasing population. |
Logistical growth | Population growth that is controlled by limited resources. |
Conjunction | A temporary union of two organism for the purpose of DNA transfer. |
Plasmid | A small circular section of DNA that confers one or more traits to a bacterium and can be reproduced separately from the main bacterium |
Transformation | The transfer of a DNA segment from a nonfunctional donor to that of a functional recipient cell. |
Transduction | The process in which infection by a virus results in DNA being transferred from one bacterium to another. |
Endospore | The DNA and other essential parts of a bacterium coated with several hard layers. |
Strains | Organisms from the same species that have markedly different traits. |
What is the most popular means by which bacteria obtain food? | Heterotroph Decomposers |
If a bacterium is parasitic, is it heterotrophic or autotrophic? | Heterotrophic |
A sample of food is dehydrated, which kills all of the bacteria. But, in a few days, bacteria free water is added to the food in a bacteria free environment. Still, investigations indicate that bacteria are in the food. How did the bacteria get there? | They were in the food as endospores |
What kind of growth does a population of bacteria experience when just a few of them are placed in an environment rich with resources? | Exponential growth |
A population of bacteria experiences logistical growth. What can you say about the resources of their environment? | The resources are limited but not gone |
A bacterium is heterotrophic and Gram-negative. To what phylum and class does it belong? | phylum Gracilicutes, class Scotobacteria |
A spirillum bacterium is Gram-positive. To what phylum and class does it belong? | phylum Firmicutes, class Thallobacteria |
A bacterium has no cell wall. to what phylum and class does it belong? | phylum Tenericutes, class Mollicutes |
A bacterium lives in boiling-hot water. To what phylum and class does it belong? | phylum Mendosicutes, class Archeabacteria |
In the six-kingdom classification system, what replaces kingdom Monera? | kingdom Archeabacteria and kingdom Eubacteria |