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TLS Online TPP Program

#Question id: 26898

Which of the following characteristics is incorrect consider in Hot desert?

#Unit 10. Ecological Principles
  1. Temperatures are variable from below freezing at night to as much as 50ºC in the day.
  2. rainfall is more than 30 cm per year
  3. Xerophytes have a thick cuticle
  4. Soils are poor and nutrient limited.
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TLS Online TPP Program

#Question id: 1545

#Unit 4. Cell Communication and Cell Signaling

B cells negatively regulated by,
TLS Online TPP Program

#Question id: 1120

#Unit 4. Cell Communication and Cell Signaling

A mutation that knocks out the GTPase activity of a G protein would have what effect on a cell?
TLS Online TPP Program

#Question id: 3985

#Unit 3. Fundamental Processes

The binding of CRP (cAMP receptor protein of E. coli) to DNA in the lac operon:
TLS Online TPP Program

#Question id: 3766

#Unit 3. Fundamental Processes

Individuals with the disorder xeroderma pigmentosum are hypersensitive to sunlight, and mutations to the DNA in their skin cells are left uncorrected. Why are the mutations not corrected in individuals with this disorder?
TLS Online TPP Program

#Question id: 12972

#Unit 10. Ecological Principles

Under  some  circumstances a  population  can  split  into  two  or  more  species  without  the  existence of  geographic barriers. All of the following genetically determined behaviours could provide conditions leading to speciation EXCEPT