Predict whether b-galactosidase will be produced by the following E. coli strain
ID: 44550 • Letter: P
Question
Predict whether b-galactosidase will be produced by the following E. coli strains under the conditions noted. The diploid genotypes represent F' (lac) strains. Use + to indicate that the enzyme is synthesized at greater than basal levels, and 0 to indicate that the enzyme is not synthesized.
(a) I+ P+ O+ Z+
(b) I- P+ O+ Z+
(c) I+ P+ OC Z+
(d) I- P+ OC Z+
(e) I- P+ OC Z-
(f) I+ P+ O+ Z-
(g) I+ P+ OC Z- / I+ P+ O+ Z+
(h) I+ P+ O+ Z- / I+ P+ OC Z+
(i) I+ P+ O+ Z- / I-P+ O+ Z+
(j) I+ P+ O+ Z+ / I-P+ O+ Z-
(k) I+ P+ OC Z- / I-P+ O+ Z+
(l) I+ P+ O+ Z- / I-P+ OC Z+
(m) I- P+ O+ Z- / I-P+ OC Z+
(n) I- P+ OC Z- / I-P+ O+ Z+
Lactose Absent Lactose Present(a) I+ P+ O+ Z+
(b) I- P+ O+ Z+
(c) I+ P+ OC Z+
(d) I- P+ OC Z+
(e) I- P+ OC Z-
(f) I+ P+ O+ Z-
(g) I+ P+ OC Z- / I+ P+ O+ Z+
(h) I+ P+ O+ Z- / I+ P+ OC Z+
(i) I+ P+ O+ Z- / I-P+ O+ Z+
(j) I+ P+ O+ Z+ / I-P+ O+ Z-
(k) I+ P+ OC Z- / I-P+ O+ Z+
(l) I+ P+ O+ Z- / I-P+ OC Z+
(m) I- P+ O+ Z- / I-P+ OC Z+
(n) I- P+ OC Z- / I-P+ O+ Z+
Explanation / Answer
The following is the pattern of Lactose synthesis in the genotype conditios described:
Genotype
Lactose absent
Lactose present
(a)I+ P+ O+ Z+
0
+
(b)I- P+ O+ Z+
0
+
(c) I+ P+ OC Z+
+
+
(d) I- P+ OC Z+
+
+
(e) I- P+ OC Z-
-
-
(f) I+ P+ O+ Z-
-
-
(g) I+ P+ OC Z- / I+ P+ O+ Z+
0
+
(h) I+ P+ O+ Z- / I+ P+ OC Z+
+
+
(i) I+ P+ O+ Z- / I-P+ O+ Z+
0
+
(j) I+ P+ O+ Z+ / I-P+ O+ Z-
0
+
(k) I+ P+ OC Z- / I-P+ O+ Z+
0
+
(l) I+ P+ O+ Z- / I-P+ OC Z+
+
+
(m) I- P+ O+ Z- / I-P+ OC Z+
+
+
(n) I- P+ OC Z- / I-P+ O+ Z+
+
+
Genotype
Lactose absent
Lactose present
(a)I+ P+ O+ Z+
0
+
(b)I- P+ O+ Z+
0
+
(c) I+ P+ OC Z+
+
+
(d) I- P+ OC Z+
+
+
(e) I- P+ OC Z-
-
-
(f) I+ P+ O+ Z-
-
-
(g) I+ P+ OC Z- / I+ P+ O+ Z+
0
+
(h) I+ P+ O+ Z- / I+ P+ OC Z+
+
+
(i) I+ P+ O+ Z- / I-P+ O+ Z+
0
+
(j) I+ P+ O+ Z+ / I-P+ O+ Z-
0
+
(k) I+ P+ OC Z- / I-P+ O+ Z+
0
+
(l) I+ P+ O+ Z- / I-P+ OC Z+
+
+
(m) I- P+ O+ Z- / I-P+ OC Z+
+
+
(n) I- P+ OC Z- / I-P+ O+ Z+
+
+