The process by which food is propelled through the digestive tract by alternating contraction and relaxation of smooth muscle is

A) elimination.
B) secretion.
C) chemical digestion.
D) peristalsis.
E) absorption.


D

Biology & Microbiology

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The molecule shown above is the purine ____

a. thymine b. adenine c. uracil d. guanine e. cytosine

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What happens to an enzyme after it has catalyzed a reaction?

a. it is sent to the proteasome for degradation b. it is inactivated by phosphorylation c. it is inactivated by dephosphorylation d. it releases the cofactor to get a new one ready for catalysis e. it returns to its original state

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Taste cells that respond to sour specifically interact with ____

a. sodium ions b. hydrogen ions c. quinine d. sugars e. glutamate

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True or False: Since 1817, cholera has swept the world in 14 major pandemics

a. TRUE b. FALSE

Biology & Microbiology