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

Biology & Microbiology

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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

Biology & Microbiology

Brachiopods develop as protostomes, but they show ______ cleavage. 

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

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

Biology & Microbiology

Antibodies from animals such as horses constitute artificially acquired passive immunity.

Indicate whether the statement is true or false.

Biology & Microbiology