Which hypothesis did Warren and Marshall test related to Helicobacter pylori bacteria and stomach ulcers?
What will be an ideal response?
The cause of many stomach ulcers is the bacterium H. pylori, not spicy food.
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A scientist studied peregrine falcons to determine why the numbers of birds was declining. She determined that
A. global warming (too much carbon dioxide) had increased the death rates in the newly hatched chicks. B. the genetic diversity of the falcons was too low to sustain their population level. C. the falcons had lost much of their habitat due to human developments. D. the falcon's habitat had been fragmented and the subsequent edge effect affected their ability to hunt for prey items. E. the levels of DDT in the environment were having a detrimental effect on eggs (causing the eggshells to be too thin) that were being laid by the female falcons.
Why does an organism that is able to respire both aerobically and anaerobically preferentially undergo aerobic respiration?
What will be an ideal response?
Staphylococcus aureus produces carotenoids that neutralize singlet oxygen and prevent killing
Indicate whether the statement is true or false.
Virus replication results in the death of the cell in ________ infection(s)
A) a lytic B) a latent C) a persistent D) a lysogenic E) both latent and persistent