#Question id: 7228
#Unit 5. Developmental Biology
Why do Drosophila wings develop in only one particular thoracic segment, legs in all three, and antennae on the head? Which of the following answer is correct?
#Question id: 28655
#Unit 2. Cellular Organization
The protein ring complexes that establish linkages between sister chromatids that is called___
#Question id: 1139
#Unit 4. Cell Communication and Cell Signaling
In paracrine signaling, the signaling molecule:
#Question id: 32922
#Unit 2. Cellular Organization
#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.