Which hypothesis was tested by Warren and Marshall during their research involving Helicobacter pylori bacteria and stomach ulcers?
A) Eating spicy food increases populations of H. pylori in the stomachs of people susceptible to ulcers.
B) The cause of many stomach ulcers is the bacterium H. pylori, not spicy food.
C) Stomach acid production is decreased by H. pylori bacteria in the stomachs of people with ulcers.
D) Acute stomach pain is often caused by H. pylori bacteria, not ulcers.
B
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If cyanobacteria never evolved during Earth's history, how would this affect the composition of Earth's atmosphere?
A. There would be less nitrogen in the atmosphere. B. There would be less carbon in the atmosphere. C. There would be less oxygen in the atmosphere. D. There would be less methane in the atmosphere. E. There would be less hydrogen in the atmosphere.
Guard cells contain chloroplasts
Indicate whether the statement is true or false.
The abbreviation n indicates cells are
A. diploid. B. autosomal. C. haploid. D. mutated. E. somatic cells.
Choose all that apply. A concentration gradient is exhibited when
A. during rest, muscle and liver cells contain high glycogen concentration and blood contains lower concentrations. B. the room temperature is 34 degree Celsius and the outside air is 34 degrees Celsius. C. the pCO2 changes from 45 to 35 mmHg in the alveoli of lungs. D. intracellular fluid has 5% solute and extracellular fluid has 0.8% solute concentration.