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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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.
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.