One organism feeds on another but does not normally kill it. 

TLS Online TPP Program

#Id: 2345

#Unit 3. Fundamental Processes

Core enzyme binds indiscriminately to any DNA. Sigma factor reduces the affinity for sequence independent binding and confers specificity for promoter.

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#Id: 1173

#Unit 7. System Physiology – Animal

There are two types of photoreceptors:

Rods 

Cones

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#Unit 7. System Physiology – Animal

Insulin secretion by the pancreatic beta cells in response to increased blood glucose concentration

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#Id: 6387

#Unit 2. Cellular Organization

Cryptic mutants” of lac operon make b-galactosidase but still could not grow on lactose means they are essentially Y-

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#Id: 1420

#Unit 4. Cell Communication and Cell Signaling

Integrins function as transmembrane linkers (integrators) between the extracellular matrix and the actin cytoskeleton.