#Question id: 15188
#Unit 13. Methods in Biology
#Question id: 2816
#Unit 2. Cellular Organization
Which of the following mutations can result in a reduction of β-galactosidase?
a. a mutation in adenylate cyclase
b. a mutation in catabolite activator protein (CAP)
c. a mutation in the CAP site in the lac control region
d. a mutation in the repressor binding site in the operator
#Question id: 7165
#Unit 5. Developmental Biology
Embryonic induction, the influence of one group of cells on another group of cells, plays a critical role in embryonic development. In 1924, Hans Spemann and Hilde Mangold transplanted a piece of tissue that influences the formation of the notochord and neural tube, from the dorsal lip of an amphibian embryo to the ventral side of another amphibian embryo. If embryonic induction occurred, which of the following observations justifies the claim of embryonic induction?
#Question id: 31382
#Unit 4. Cell Communication and Cell Signaling
#Question id: 4121
#Unit 3. Fundamental Processes
The transition from the closed to the open complex involves structural changes in the enzyme and the opening of the DNA double helix to reveal the template and nontemplate strands. This “melting” involves
A. Isomerization reaction and it does not require energy derived from ATP hydrolysis
B. Isomerization is essentially irreversible and, once complete, typically guarantees that transcription will subsequently initiate
C. Positions –11 and -2, with respect to the transcription start site.