#Question id: 7275
#Unit 5. Developmental Biology
The following experiment is designed to study the role of several hormones in the regulation of metamorphosis in frogs.
|
Group # |
Treatment |
Days
to Metamorphosis |
|
1 |
Saline |
30 |
|
2 |
Prolactin |
> 100 |
|
3 |
TSH |
15 |
|
4 |
Thyroxine |
10 |
|
5 |
Corticosterone |
30 |
|
6 |
Thyroxine
+ Corticosterone |
5 |
|
7 |
Prolactin + TSH |
30 |
|
8 |
Thyroid gland
removed |
> 100 |
If the thyroid gland were removed from the tadpoles in Group 4, metamorphosis would
#Question id: 21271
#Unit 12. Applied Biology
Which one of the following is a detection device or transducer?
#Question id: 19708
#Unit 13. Methods in Biology
#Question id: 4107
#Unit 3. Fundamental Processes
Imagine that you have created a fusion between the Trp operon, which encodes the enzymes for tryptophan biosynthesis, and the Lac operon, which encodes the enzymes necessary for lactose utilization. Under which set of conditions (A–F below) will β-galactosidase be expressed in the strain that carries the fused operon?
A. Only when lactose and glucose are both absent.
B. Only when lactose and glucose are both present.
C. Only when lactose is absent and glucose is present.
D. Only when lactose is present and glucose is absent.
E. Only when tryptophan is absent.
F. Only when tryptophan is present.
#Question id: 23531
#General Aptitude