BIOL-2420

Question 1

Tests Performed

Answer 1

1) Phenol Red Test
2) Oxidase Test
3) TSI (Triple Sugar Iron) Test
4) Decarboxylation Test

Question 2

Phenol Red Test

Answer 2

test to see what sugars are digested by bacteria
bacteria: E.coli, A. faecalis, and S. aureus;
sugars used: glucose, sucrose, lactose

results: see for color change and gas production
color change: yellow; acid production
bubbles

Question 3

Phenol Red Test: E.coli

Answer 3

1) glucose: acid & bubbles
2) sucrose: no acid or bubbles
3) sucrose: acid & bubbles

Question 4

Phenol Red Test: S. aureus

Answer 4

1) glucose: acid & no bubbles
2) sucrose: acid & no bubbles
3) sucrose: acid & no bubbles

Question 5

Phenol Red Test: A. faecalis

Answer 5

1) glucose: no acid & no bubbles
2) sucrose: no acid & no bubbles
3) sucrose: no acid & no bubbles