In which digestive system organ does nearly all nutrient absorption occur? (A) stomach (B) small intestine (C) large intestine (D) pancreas

Which of the following organs is incorrectly paired with its function?a. stomach—protein digestionb. large intestine—bile productionc. small intestine—nutrient absorptiond. pancreas—enzyme production

After finding a gene that causes a disease, researchers often introduce the defective allele into mice to create an animal model of the disease. Why are these models valuable?a. They allow the testing of potential drug therapies without endangering human patients.b. They allow the sequencing of the mutant allele.c. They allow the production of large quantities of the defective gene product, usually a protein.d. They allow the study of how the gene was transmitted from parents to offspring.

Earthworms, which are substrate feeders.feed mostly on mineral substrates.filter small organisms from the soil.are bulk feeders that ingest large pieces of food.eat their way through the soil, feeding on partially decayed organic matter.

Cellulose is fermented in which of the following structures in rabbits?a. small intestineb. cecumc. abomasumd. rumen

Which of the following is not a major activity of the stomach?a. storageb. HCl productionc. nutrient absorptiond. enzyme secretion

The human genome size is 3 billion base pairs, and the size of the baker's yeast genome, a single-celled organism, is 12 million base pairs. Therefore, the predicted genome size for another single-celled organism, an amoeba,a. is about the size of the human genomeb. is about the size of the yeast genomec. is somewhere between the sizes of the yeast and human genomesd. cannot be predicted with any certainty

The energy content of fatsa. is released by bile salts.b. is, per gram, twice that of carbohydrates or proteins.c. cannot be dissolved in water and so cannot be absorbed.d. is usually healthier than the energy content of carbohydrates.

Which of the following vitamins is mismatched with the disease that results from its underconsumption?a. vitamin B6—beriberib. vitamin C—scurvyc. vitamin A—vision lossd. vitamin D—rickets