Answer the following statement(s) true (T) or false (F)
1. Facultative anaerobes do not have the correct enzymes, and will not survive in the presence of oxygen.
2. Bacterial cells generally have a cell wall which protects them from osmotic changes in their environment, while animal cells do not and so are more sensitive to osmotic shifts.
3. Pasteurization sterilizes milk.
4. You will need to do a serial dilution for the standard plate count water test.
5. Protists are a large and diverse group, including organisms such as algae.
1. False
2. True
3. False
4. False
5. True
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Incubation of cells at 20°C blocks the release of proteins from the trans-Golgi. Under such conditions, you would expect to see
A. an increase in exocytosis. B. a decrease in exocytosis. C. an increase in endocytosis. D. a decrease in endocytosis.
Why is it unlikely that genetically engineered strains of bacteria would pose a threat to the
environment? a. Genetically engineered bacteria cannot survive exposure to UV radiation. b. Genetically engineered strains of bacteria are strictly regulated, making accidental release unlikely. c. Genetically engineered strains of bacteria cannot survive exposure to oxygen. d. Genetically engineered strains of bacteria are poor competitors of wild strains. e. Genetically engineered strains of bacteria require supplemental nutrients to survive.
Which of the following kinds of extinction has been linked to collisions of bolides with earth?
A) background extinction B) mass extinction C) anthropogenic extinction
Which of the following features are characteristic of fungi?
A) Cell walls, photosynthesis, and usually filamentous bodies B) No cell walls, parasitic, heterotrophic C) Cell walls, chemosynthetic, heterotrophic D) No cell walls, feeding by absorption, chemosynthesis E) Cell walls, feeding by absorption, and usually filamentous bodies