Question

The phenylalanine test is conducted A. in a broth tube B. on an agar slant C....

The phenylalanine test is conducted

A.

in a broth tube
B.

on an agar slant
C.

on an agar plate.
D.

A & C

When is the reagent added to the medium?

A.

When the medium is prepared
B.

Right after inoculation
C.

Right before incubation
D.

After incubation

What indicates a positive catalase test?

A.

Color change of the hydrogen peroxide
B.

Clotting of plasma on the slide
C.

Presence of bubbles on the slide
D.

A & B
Science   Biology   
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Answer #1

The correct option is B on an agar slant.... A The phenylalanine slant is used as te test medium...A medium is regular agar slant with an extra  phenylalanine added ..it has no indicators

The correct option is D After incubation After incubation, 10% ferric chloride is added to the media; if phenylpyruvic acid was produced, it will react with the ferric chloride and turn dark green.

The correct option is C Bubbles are a positive result for the presence of catalase. If no bubbles form, it is a negative result; this suggests that the organism does not produce catalase.

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