Placozoans (select all that apply)
A. are tiny animals containing only a few
thousand cells.
B. are simple animals, consisting of only 2
tissue layers that sandwich an interior fluid
layer.
C. are, in spite of their morphological
simplicity, genetically complex, sharing many
genes for transcription factors, signaling
molecules, and structural proteins with both
cnidarians and bilaterians animals.
D. are a highly diverse group, consisting of
many species occupying a wide range of
habitats.
E. are large radially symmetrical animals
superficially similar to cnidarians and
ctenophores.
A,B
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The coding region of mRNA is called a(n) ; ____ , whereas the noncoding region is called an ____
Fill in the blank with the appropriate word.
Molecules or regions of molecules that readily interact with water are said to be ________, whereas molecules or regions of molecules that are insoluble in water or do not readily interact with water are said to be hydrophobic.
Fill in the blank(s) with the appropriate word(s).
The two proteases in the small intestine that complete protein digestion are
a. aminopeptidase and dipeptidase. b. aminopeptidase and disaccharidase. c. dipeptidase and disaccharidase. d. dipeptidase and phosphatase. e. nucleotidase and nucleosidase.
The process by which a bacterium uses a sex pilus to transfer genetic information to another bacterium is
A. conjugation. B. mitosis. C. replication. D. apomixis. E. parthenogenesis.