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TLS Online TPP Program

#Question id: 5003

Fruit fly eyes are of the compound type, structurally very different from the camera-type eyes of mammals. Even the camera-type eyes of mollusks, such as octopi, are structurally quite different from those of mammals. Yet, fruit flies, octopi, and mammals possess very similar versions of Pax-6. The fact that the same gene helps produce very different types of eyes is most likely due to

#Unit 11. Evolution and Behavior

  1. the few differences in nucleotide sequence among the Pax-6 genes of these organisms.

  2. variations in the number of Pax-6 genes among these organisms.

  3. the independent evolution of this gene at many different times during animal evolution.

  4. differences in the control of Pax-6 expression among these organisms.

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TLS Online TPP Program

#Question id: 12202

#Unit 6. System Physiology – Plant

Auxin-responsive genes typically have
TLS Online TPP Program

#Question id: 12203

#Unit 6. System Physiology – Plant

Which factor function as auxin co-receptors, with auxin acting as a “molecular glue”?
TLS Online TPP Program

#Question id: 12204

#Unit 6. System Physiology – Plant

Feedback regulation represents another key mechanism employed to attenuate a response such as
a) AUX/IAA proteins can bind to the promoters of their own genes and repress their own expression
b) auxin signaling triggers the degradation of AUX/IAA repressors, the ensuing transcription of auxin response genes leads to the replacement of AUX/IAA proteins and thus to response attenuation or termination
c) AUX/IAA genes, which encode the AUX/IAA auxin repressor proteins, have auxin response element binding sites located in their promoter regions
During the feedback regulation mechanism of auxin several responses are trigger, find out the correct sequences of these responses.
TLS Online TPP Program

#Question id: 12205

#Unit 7. System Physiology – Animal

Before the preovulatory surge in luteinizing hormone, granulosa cells of the follicle secrete which of the following?
TLS Online TPP Program

#Question id: 12206

#Unit 7. System Physiology – Animal

Neonates that are kept in 100% oxygen incubators for several days become blind when they are removed from the incubator, a condition referred to as retrolental fibroplasia. What is the explanation for the loss of sight?
TLS Online TPP Program

#Question id: 12207

#Unit 7. System Physiology – Animal

Which of the following hormones activate enzyme-linked receptors?