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TLS Online TPP Program

#Question id: 7310

Which statement best describes the mechanism for circadian rhythm?

#Unit 5. Developmental Biology
  1. There is an alternation between enhanced and inhibited expression of clock genes.
  2. Clock genes inhibit gene expression of positive elements.
  3. Clock genes inhibit expression of negative elements.
  4. The time-keeping mechanism depends only on the breakdown of negative elements.
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TLS Online TPP Program

#Question id: 3020

#Unit 2. Cellular Organization

During which phase of the bacterial growth curve does the total number of viable cells decline?
TLS Online TPP Program

#Question id: 11471

#Unit 7. System Physiology – Animal

Hair cells in the vertebrate ear are responsible for transducing sound pressure waves. Ion channels in the hair cell membrane open when ________.
TLS Online TPP Program

#Question id: 12583

#Unit 10. Ecological Principles

Which of the following is caused by excessive nutrient runoff into lakes?  
TLS Online TPP Program

#Question id: 7758

#Unit 5. Developmental Biology

Chlorophyll is tightly bound in complexes with proteins. During senescence these chlorophyll–protein complexes must be dismantled to allow the apoproteins to be recycled by___
TLS Online TPP Program

#Question id: 3446

#Unit 11. Evolution and Behavior

Which of the following is least related to the others?