#Question id: 746
#Unit 1. Molecules and their Interaction Relevant to Biology
Two separate chains of DNA are wound around each other, each following a helical (coiling) path, resulting in:
#Question id: 3459
#Unit 11. Evolution and Behavior
A vampire bat sharing blood with another bat that is not its kin is an example of ________.
#Question id: 4073
#Unit 3. Fundamental Processes
The expression of which gene(s) is (are) regulated by promoter proximal pausing?
#Question id: 7187
#Unit 5. Developmental Biology
Following statements regarding to feedback loops during limb development.
A. When the limb bud is relatively small, an initial positive feedback loop is established between Fgf10 produced in the mesoderm and Fgf8 produced in the ectoderm, promoting limb outgrowth.
B. As the limb bud grows, the ZPA is established, and another regulatory loop is created by inhibiting the BMP in mesoderm and maintain FGF expression.
C. In anterior region of the limb bud, Fgf8 positively regulates Etv4/5, which in turn repress Shh in this region, further reinforcing the posterior-to-anterior gradient of Shh from the ZPA.
D. In posterior region of the limb bud, Fgf8 positively regulates Etv4/5, which in turn repress Shh in this region, further reinforcing the posterior-to-anterior gradient of Shh from the ZPA.
Which of the following combinations are incorrect?
#Question id: 32359
#Unit 1. Molecules and their Interaction Relevant to Biology
