Heart valve replacement in humans using a pig valve is an example of a(n)

A) autograft.

B) isograft.

C) allograft.

D) xenograft.


D) xenograft.

Biology & Microbiology

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Methylene blue in EMB agar is selective for

A) gram-positives. B) gram-negatives. C) viral plaques. D) both gram-positives and gram-negatives.

Biology & Microbiology

Most chytrids are ____

a. saprobes in soil b. parasites of plants c. symbiotic partners of cattle d. parasites of animals e. aquatic

Biology & Microbiology

Tendons and ligaments are composed of ________.

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

Biology & Microbiology

One of the most significant steps in the evolution of true cells from macromolecular assemblages was the evolutionof:a

electronegativity. b. covalent bonding. c. hydrogen bonding. d. valence electrons. e. molecular reproduction

Biology & Microbiology