In an individual heterozygous, the abnormal chromosome loops out during chromosome pairing in prophase I, in which condition?

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#Question id: 3440

#Unit 11. Evolution and Behavior

Which of the following is least related to the others?

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#Question id: 14836

#Unit 5. Developmental Biology

In the case of the French flag model. we assume a source of morphogen at one end and a sink at the other and that the concentrations of morphogen at both ends are kept constant but are different from each other. If the cells can respond to threshold concentrations of the morphogen, Thresholds can represent the

a. amount of morphogen that must bind to receptors to activate an intracellular signaling system. 

b. concentrations of transcription factors required to activate particular genes.

c. concentration at any point effectively provides positional information.

d. amount of morphogen that must bind to receptors to inactivate an extracellular signaling system.

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#Question id: 3653

#Unit 3. Fundamental Processes

Cyclobutane pyrimidine dimers are formed by -------------from adjacent pyrimidines on one strand by cyclization of the double-bonded C5 and C6carbon atoms of each base to give a cyclobutane ring.

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#Question id: 1809

#Unit 4. Cell Communication and Cell Signaling

Which of the following statements is TRUE of αβ T-cells?

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#Question id: 28402

#Unit 5. Developmental Biology

A cell that high level of β-catenin with high concentration of nodal related protein and also have vegT and vg1 expression that type of cell undergo to the formation of which structure?