As food is chemically digested by the stomach, the pH of the gut fluids becomes very acidic. However, when the chyme is further processed in the small intestine, the gut fluid pH cannot remain that acidic
Explain the physiological processes that occur to chyme as it enters the duodenum to ensure that the pH is not damaging to the small intestine.
Chyme has a very low pH that must be neutralized as it enters the duodenum. The pancreas aids in the neutralization by releasing bicarbonate ions into the duodenum. These ions are essential because pancreatic enzymes work best at more neutral pH.
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The Cretaceous is the most recent period of the ____ era
a. Paleozoic b. Cenozoic c. Mesozoic d. Proterozoic e. Archaean
Due to global warming what occurred in fish in the North and Celtic seas?
A) Species richness increased. B) Species richness declined. C) Fewer deep-water species were present. D) Fewer shallow-water species were present.
There are 64 sense codons in the genetic code and 61 different types of tRNA molecules
Indicate whether the statement is true or false
The species richness of insects on trees can be predicted by which of the following?
A. The area hypothesis B. The evapotranspiration rate C. The average body size of insects D. The species-time hypothesis