Two primary factors in shaping the polarity of the body axes in chick embryos are _____
A) light and temperature
B) salt gradients and membrane potentials
C) gravity and pH
D) moisture and mucus
C
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________ are charged molecules that are partially responsible for the ________ charge of the gram-positive bacterial cell surface
A) Diaminopimelic acids / positive B) Teichoic acids / negative C) Phospholipids / negative D) Peptide interbridges / neutral
Brachiopods develop as protostomes, but they show ______ cleavage.
Fill in the blank(s) with the appropriate word(s).
Answer the question using the accompanying figure. In the figure, letter A represents a ____ taxon, which includes ____
a. polyphyletic; species from different evolutionary lineages
b. polyphyletic; an ancestral species and all of its descendants c. paraphyletic; an ancestral species and only some of its descendants d. monophyletic; species from different evolutionary lineages e. monophyletic; an ancestral species and all of its descendants
Antibodies from animals such as horses constitute artificially acquired passive immunity.
Indicate whether the statement is true or false.