Once stem cells become positioned farther from the niche, signaling factors cannot reach them, and differentiation commences.

TLS Online TPP Program

#Id: 1838

#Unit 11. Evolution and Behavior

Paleogene- Radiation of mammals, birds, snakes, angiosperms, pollinating insects

TLS Online TPP Program

#Id: 9300

#Unit 4. Cell Communication and Cell Signaling

Rhodopsin has two components: 

Opsin protein, member of the GPCR A family 

11-cis-retinal light-absorbing pigment

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#Id: 120

#Unit 5. Developmental Biology

Reciprocal induction occurs when the two interacting tissues are both inducers and are competent to respond to each other’s signals.

TLS Online TPP Program

#Id: 7806

#Unit 10. Ecological Principles

TEMPORAL ENVIRONMENTAL VARIATION describes how environmental conditions change over time.

TLS Online TPP Program

#Id: 6028

#Unit 3. Fundamental Processes

RFC is a clamp loader that catalyzes the loading of PCNA onto DNA. It binds to the 3’ end of the DNA and uses ATP hydrolysis to open the ring of PCNA so that it can encircle the DNA.