The main costimulatory signal for activation of resting T-cells is provided by ligation of:

#Question id: 28405

#Unit 5. Developmental Biology

BMP inhibitors secreted by the organizer that involve to inhibiting the expression of BMP at the dorsal side of the embryo, these organizers are____

#Question id: 8961

#Unit 9. Diversity of Life Forms

#Question id: 2658

#Unit 2. Cellular Organization

This condition in lac operon facilitates the condition of lac genes being transcribed at high levels

#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.

#Question id: 10863

#Unit 10. Ecological Principles

According to the ____________ principle, two species with identical requirements for existence cannot coexist indefinitely