CELE DOLUJO UNO
2. Which of the following statements about metal elements is correct?
A. A metal atom can take an electron from a non-metal atom.
OB. Metal elements are always heavier than non-metal elements
C. Metals tend to easily lose their valence electrons.
D. Metals tend to easily gain more valence electrons.
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9

Consider a culture medium on which only gram-positive organisms such as staphylococcus aureus colonies can grow due to an elevated nacl level. a yellow halo surrounds the growth, indicating the bacterium fermented a sugar in the medium, decreasing the ph as a result and changing the color of a ph indicator chemical. this type of medium would be referred to as a differential and enrichment culture.