TLS Online TPP Program

#Question id: 1735


In the immunological synapse:

#Unit 4. Cell Communication and Cell Signaling
  1. The acetylcholine receptor in expressed on the T-cell

  2. Production of substance P by the antigen-presenting cell is a key event

  3. The initial interaction between TCR and MHC is unstable

  4. Adhesion molecule pairs eventually move to the center of the synapse

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TLS Online TPP Program

#Question id: 8694

#Unit 9. Diversity of Life Forms

Which of the following is (are) problematic when the goal is to construct phylogenies that accurately reflect evolutionary history?

TLS Online TPP Program

#Question id: 3454

#Unit 11. Evolution and Behavior

Altruism is favoured when rb - c > 0 where c is fitness cost to altruist, b is fitness benefit to recipient; and r is genetic relatedness. It is under negative selection when

TLS Online TPP Program

#Question id: 3321

#Unit 11. Evolution and Behavior

When an allele at one locus spreads by natural selection acting on a second locus knows as

TLS Online TPP Program

#Question id: 4862

#Unit 8. Inheritance Biology

In guinea pigs, white coat (w) is recessive to black coat (W) and wavy hair (v) is recessive to straight hair (V). A breeder crosses a guinea pig that is homozygous for white coat and wavy hair with a guinea pig that is black with straight hair. The F1 are then crossed with guinea pigs having white coats and wavy hair in a series of testcrosses. The following progeny are produced from these testcrosses:

black, straight  -   220             black, wavy  -30

white, straight  -30                   white, wavy- 220

If the genes are not assorting independently, what is the distance between coat color and hair shape governing gene

TLS Online TPP Program

#Question id: 9184

#Unit 9. Diversity of Life Forms

Which aquatic biome listed here is one of the most productive on Earth, and why?