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TLS Online TPP Program

#Question id: 15762

Which of the following is not a property of the stem cells?

#Unit 5. Developmental Biology
  1. They are specialized and differentiated cells that can regenerate themselves
  2. They generate specific types of more specialized cells 
  3. They maintain the ability to generate effectively unlimited populations of daughter cells that can go on to proliferate and differentiate 
  4. They are unspecialized cells that can reproduce themselves
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TLS Online TPP Program

#Question id: 33151

#Unit 2. Cellular Organization

Which sequences are required for the inhibitory phosphorylation of tyrosine and threonine residues which is essential for the regulation of mitotic CDKs?
TLS Online TPP Program

#Question id: 12411

#Unit 10. Ecological Principles

Plant population age pyramids
TLS Online TPP Program

#Question id: 672

#Unit 1. Molecules and their Interaction Relevant to Biology

An ideal α-helix has a pitch of 0.54 nm and a rise of 0.15 nm. What is the length along the helix axis for a segment of an ideal α-helix that contains 30 amino acids?
TLS Online TPP Program

#Question id: 1478

#Unit 4. Cell Communication and Cell Signaling

Caspases are different on the basis of:
TLS Online TPP Program

#Question id: 2668

#Unit 2. Cellular Organization

The toxic shock syndrome toxin is produced by some Salmonella species when there is not sufficient iron present. When iron is present, it prevents transcription of the TSS-toxin gene. Iron therefore serves as __________.