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Thinking Scientifically
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1. How can people consume vastly different diets yet obtain adequate nourishment?

2. Why can’t a person gain nutritional benefits by finely grinding meat and injecting it into the bloodstream?

3. Name an organelle in human cells that has a function similar to protozoan intracellular digestion.

4. The protein in a hamburger is mostly myosin. Why doesn’t the human body simply use the cow version of myosin to build muscle tissue? What happens instead?

5. Orlistate is a new weight loss drug that inhibits the activity of lipases in the small intestine. Why would this be more effective than a drug that blocks absorption of proteins or carbohydrates? What might be aside effect of blocking fat absorption?


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Additional Questions and Terms

1. Why can certain tripeptides cross intestinal lining cells, but others must be dismantled to dipeptides or even single amino acids to do this?

2. So-called fat-free cakes and cookies contain diglycerides which are technically not fats. In the small intestine, the diglycerides are repackaged into triglycerides. In which part of a villus would this probably occur?

3. Type II diabetes results from the inability of cells to recognize and bind insulin. Describe how a similar defect in leptin metabolism might cause obesity.

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