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Exam #1
Bio Final
| Question | Answer |
|---|---|
| Characteristic of plasma membrane | composed of a phospholipid bilayer contains proteins selectively permeable site of facilitated diffusion DOES NOT maintain cell shape |
| Reason why gram stain can work to produce two differently colored cell types is: | The addition of alcohol punches holes in the thin petiodoglycan layer of gram-negative cells, allowing the release of crystal violet from the cells |
| Death and Growth Phase | exponential rate |
| Stationary Phase | can form endospores normally during the stationary phase, occurs because of the build up of toxic waste products |
| Pili are used by bacteria to | transfer DNA to other bacteria |
| Staphylococcus colonies with a yellow halo around it are: | selective medium and differential medium |
| The shape of the bacterium Rhodospirillum rubrum is: | spiral |
| one advantage of using agar as a solidifying agent for culture media is: | it's not eaten by bacteria |
| inclusion bodies that are not used for storage purposes in microorganisms | gas vacuoles, magnetosomes |
| disadvantage of using the Petroff-Hauser counter to determine the number of bacteria in a contaminated water sample | not useful for motile bacteria counts dead and alive bacteria |
| nanometers in one meter | 10^9 |
| similarity and difference between prokaryotes and eukaryotes | cytoplasm prokaryotes don't have a nucleus |
| microscope used to visualize unstained, livng bacterial cells wehre no detail of internal structure is needed | phase contrast |
| photoautotrophs use light as an energy source and (blank) as a carbon source | carbon dioxide |
| Joseph Lister is known for | steralizing surgical instruments |
| antibacterial drugs do not harm animal cells because they target the (blank) in bacterial cells | peptidoglycan |
| indirect method of measuring bacterial cell numbers is using | turbidity measurement |
| smallest microorganisms are examples of | viruses |
| growth factor | Organic compounds that need to be supplied to organisms in order for them to grow as they are not able to make these themselves |
| biotechonology | The use of technology such as molecular biology and genetic engineering to manipulate biological systems |
| generation time | the time it takes for a microorganism to grow and divide |
| aseptic technique | using techniques that prevent contamination of the environment,yourself and your experiment with unwanted microoganisms or other contaminants |
| pleomorphic bacteria | bacteria with many different shapes |
Created by:
lnkek
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