Practice Questions

TLS Online TPP Program

#Question id: 10245

Which of the following exemplifies an evenly spaced distribution?

#Unit 10. Ecological Principles

Salamanders that live under logs
Birds traveling in large flocks
Desert shrubs that exclude one another from zones of intense competition
Earthworms distributed in a homogeneous mass of soil without regard to the presence of other earthworms

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TLS Online TPP Program

#Question id: 1346

#Unit 4. Cell Communication and Cell Signaling

Although the protein families that comprise the ECM are very different, they have one of the following characteristics in common:

TLS Online TPP Program

#Question id: 13168

#Unit 10. Ecological Principles

Use the following diagram from the text showing the spread of the cattle egret, Bulbulcus ibis, since its arrival in the New World, to answer the following question.

How would an ecologist likely explain the expansion of the cattle egret?

TLS Online TPP Program

#Question id: 12400

#Unit 6. System Physiology – Plant

Given some statements about auxin signal transduction pathway;

a) ARFs bind the AuxRE stably, must form dimers promote transcription by binding to two AuxREs arranged in a palindrome

b) inactive heterodimers may act to inhibit ARF–AuxRE binding, thereby blocking either gene activation or repression

c) Protein encodes the AUX/IAA gene family can inhibit the transcription of early auxin response genes by forming inactive heterodimers with ARFs

d) Auxin induces the transcription of the early response genes by promoting the proteolytic degradation of the inhibitory AUX/IAA proteins so that active ARF dimers can form

e) AUX/IAA turnover to involve ubiquitination by a ubiquitin ligase and proteolysis by the massive 26S proteasome complex

f) A negative feedback loop is introduced into the pathway by virtue of the fact that one of the gene families turned on by auxin is AUX/IAA, which inhibits the response.

Find out the correct sequence from the following above statements;