Clostridium tetani, the bacterium that causes tetanus, can survive in soil for up to 40 years. It is most likely in which of the following structures?
A. a cell membrane
B. a nucleus
C. a cell wall
D. a pilus
E. an endospore
Answer: E. an endospore
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The pH of your small intestines is around 7.5 and the pH of your large intestine can be 5.5. As substances travel from the small intestines to the large intestine, what would happen to the H+ ion concentration?
A. It decreases 100 fold. B. It increases by 100 fold. C. It increases 10 fold. D. It increases 2 fold. E. It decreases 10 fold.
In living organisms, emergent properties
A. functionally arise from smaller successful parts and work together for a more successful organism. B. are produced in a new generation of offspring that will show the properties. C. develop tissue and organ systems, which show higher levels of complexity. D. functionally arise from larger successful parts working together for stronger organism. E. evolve new properties from other similar organisms.
The product of the p53 gene _____
A) inhibits the cell cycle B) slows down the rate of DNA replication by interfering with the binding of DNA polymerase C) causes cells to reduce expression of genes involved in DNA repair D) allows cells to pass on mutations due to DNA damage
Which structure protects pathogenic bacteria from phagocytosis?
a) Capsule b) Endospore c) Flagellum d) Axial filament