After you swallow the first bite of your food, your stomach becomes active. Polypeptides in the ingested food stimulate the stomach to release acid and enzymes, which creates more polypeptides. This greater concentration of polypeptides stimulates the
stomach to release even more acid and enzymes, which continues until the contents of the stomach pass into the next digestive chamber. This phenomenon is best explained by
A) positive feedback control.
B) the relationship between structure and function.
C) how evolution does not lead to a perfect animal form.
D) how different tissues form an organ.
Answer: A
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Until Europeans began worldwide colonial activities about 500 years ago, humans had not introduced exotic species anywhere.
a. true b. false
The Tat system is involved in
A) protein synthesis. B) transcriptional initiation. C) protein folding. D) protein secretion.
Which receptor is associated with the perception of pain?
A. thermoreceptor B. chemoreceptor C. nociceptor D. photoreceptor
Consider a diploid species where n=5. If an individual of this species was found to have 11 chromosomes, it would be categorized as
A. polyploid. B. aneuploid. C. tetraploid D. monosomic. E. triploid.