Exocrine glands secrete all of the following EXCEPT ____

a. milk
b. hormones
c. saliva
d. earwax
e. enzymes


ANSWER: b

Biology & Microbiology

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Gene regulation by siRNA is ____ in eukaryotes and may have evolved originally as a ____

A. rare; way to regulate gene expression B. widespread; way to regulate gene expression C. rare; defense against mutations that may cause cancer D. widespread; defense against viruses E. rare; defense against viruses

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What is the thick fluid, rich in proteins and lipids, which is deposited in an animal's egg during its formation?

a. germ layer b. placenta c. yolk d. corpus luteum e. gastrula

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Insects have a __________, with many individual units. Fill in the blank(s) with the appropriate word(s)

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In the process of peristalsis:a

waves of muscular contractions force food down the digestive tract. b. chemical digestion of food takes place in the digestive tract. c. food is discharged from the bodies of unicellular animals. d. digestion occurs intracellularly within food vacuoles. e. digestion of food takes place outside the body of an animal.

Biology & Microbiology