Which embryonic tissue is incorrectly associated
with its derivative?
a. skin; mesoderm
b. nervous system; ectoderm
c. liver; endoderm
d. circulatory system; mesoderm
e. brain; ectoderm
Answer: a
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Structures known as microvilli are associated with:
A. communication between cells. B. increased surface area for gas exchange. C. adhesion to the extracellular matrix. D. increased surface area for nutrient absorption.
The interaction of many separate polypeptide chains determines the ____________________ structure of a protein
molecule. Fill in the blank(s) with the appropriate word(s).
Compare and contrast the digestive process in animals with two-way flow through their digestive
system and those that have a digestive system with one-way flow. What will be an ideal response?
The Y chromosome
a)is larger than the X chromosome. b)contains more genes than the X chromosome. c)is the same size as the X chromosome. d)is smaller than the X chromosome. e)is genetically identical to the X chromosome.