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TLS Online TPP Program

#Question id: 3979

“Housekeeping genes” in bacteria are commonly expressed constitutively, but not all of these genes are expressed at the same level (the same number of molecules per cell).  The primary mechanism responsible for variations in the level of constitutive enzymes from different genes is that:

#Unit 3. Fundamental Processes

  1. all constitutive enzymes are synthesized at the same rate, but are not degraded equally.

  2. their promoters have different affinities for RNA polymerase holoenzyme.

  3. some constitutively expressed genes are more inducible than others.

  4. some constitutively expressed genes are more repressible than others.

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TLS Online TPP Program

#Question id: 24234

#Unit 4. Cell Communication and Cell Signaling

Name of the cadherin-family member which is highly expressed in epithelial cells in the human airway, act as a receptor for RV-C
TLS Online TPP Program

#Question id: 28390

#Unit 5. Developmental Biology

During Vegetal cells asymmetrically press up against the inner blastocoel roof on the dorsal side of the embryo is referred to as____
TLS Online TPP Program

#Question id: 11983

#Unit 10. Ecological Principles

Which of the following is a behavioral pattern resulting from an ultimate cause?
TLS Online TPP Program

#Question id: 8687

#Unit 9. Diversity of Life Forms

Your professor wants you to construct a phylogenetic tree of orchids. She gives you tissue from seven orchid species and one lily. What is the most likely reason she gave you the lily?
TLS Online TPP Program

#Question id: 1619

#Unit 4. Cell Communication and Cell Signaling

Which of the following statements is TRUE of interferons?