Genes with Similar Sequences in Two Different Species of Organisms,such

question 29

Multiple Choice

Genes with similar sequences in two different species of organisms,such as humans and mice

• A)produce essentially identical products that have essentially identical functions.
• B)may produce products that have slightly to dramatically different functions.
• C)almost always have completely different functions in the two species.
• D)there is no way of predicting whether the gene will function the same way or differently.
• E)are nearly always nonfunctional or "nonsense" DNA in one of the species,present only as a transposon.

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Definitions:

Plicae Circularis

Internal folds of the intestinal lining that increase surface area for absorption of nutrients.

Absorption

The process by which substances are taken up from the environment and enter the bloodstream or cells.

Hepatic Portal Vein

Portal vein formed by the superior mesenteric and splenic veins and entering the liver.

Nutrient-Rich Blood

Blood that is high in oxygen and nutrients, often a result of digestion and absorption in the small intestine, ready to be distributed throughout the body.