The lining of the intestinal tract is produced by
a. the ectoderm.
b. the endoderm.
c. the mesoderm.
d. the endoderm and mesoderm.
e. all of the germ layers.
Answer: b
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Some marine species of cyanobacteria
A. do not have flagella and are, therefore, nonmotile. B. do not have flagella but are, nonetheless, motile by some unknown mechanism. C. do not have flagella but are motile by means of pseudopods. D. have flagella and are, therefore, motile.
The tiny chambers in osteons that contain osteocytes are called _____.
Fill in the blank(s) with the appropriate word(s)
Which of the following functions of genetic material accounts for the appropriate expression of proteins?
a. Ability to replicate b. Ability to replicate and transmission to the next generation ] c. Transmission to the next generation d. Information storage e. Production of variation within and between species
Which of the following contains a polar covalent bond?
A) O-H B) C-H C) H-H D) Na-Cl