The purpose of a mordant in the Gram stain is

a. To make the flagella visible.
b. To remove the simple stain.
c. To make gram-negative cells visible.
d. To make the bacterial cells larger.
e. To prevent the crystal violet from leaving the cells.


Answer: e. To prevent the crystal violet from leaving the cells.

Biology & Microbiology

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Answer the following statement true (T) or false (F)

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Chitons, snails, clams and squid all belong to this phylum:

a. Mollusca. b. Gastropoda. c. Bivalvia. d. Platyhelminthes. e. Cephalopoda.

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A community refers to ____

a. the interaction between populations and their environment b. the interaction between species and their environment c. an area in which a single species lives d. all species that live and interact in a specific area e. the nonliving components of an area

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The accumulation of dead keratinocytes and the protein ____ on the skin surface forms a waterproof barrier

a. collagen b. elastin c. keratin d. albumin e. myosin

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