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TLS Online TPP Program

#Question id: 1262

Although MAP kinase is often activated in multicellular animals by RTKs or cytokine receptors, signaling from other receptors can activate MAP kinase in other eukaryotic cells. we consider the mating pathway in the yeast S. cerevisiae, a well-studied example of a MAP kinase cascade linked to G protein–coupled receptors (GPCRs). Which of the following statement is incorrect?

#Unit 4. Cell Communication and Cell Signaling

  1. An a haploid cell secretes the a mating factor and has GPCRs for the α factor on its cell surface; an α cell secretes the α factor and has GPCRs for the a factor. Thus each type of cell recognizes the mating factor produced by the opposite type.

  2. Ligand binding and dissociation of the G protein subunits, the membrane-tethered Gβγ subunit binds the Ste5 scaffold to the plasma membrane.

  3. Gβγ also activates Cdc24, a GAP for the Ras-like protein Cdc42; the active, GTP-bound Cdc42, in turn, binds to and activates the Ste20 kinase.

  4. Ste20 then phosphorylates and activates Ste11, which is analogous to Raf and other mammalian MEK kinase (MEKK) proteins. Ste20 thus serves as a MAPKKK kinase.

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TLS Online TPP Program

#Question id: 3462

#Unit 11. Evolution and Behavior

Which describes brightly colored peacocks mating more frequently than drab peacocks?
TLS Online TPP Program

#Question id: 3463

#Unit 11. Evolution and Behavior

Which one of the following statements is INCORRECT?
TLS Online TPP Program

#Question id: 4716

#Unit 11. Evolution and Behavior

Which of the following is correct match?

AWallaceI Changes in allele frequency due to random genetic drift
BSewall WrightII Evolution by natural selection
CCarl WoeseIII hybrid sterility
DHaldane's ruleIV DNA sequencing led to molecular phylogenetics
TLS Online TPP Program

#Question id: 3508

#Unit 11. Evolution and Behavior

In these cases, females would indirect benefit by choosing the male that having which of following attribute 

a. can provide the best care

b. provide no care, but maintain territories

c. Large males, have probably been successful at living long, acquiring a lot of food and resisting parasites and disease

d. The long tail of the peacock
TLS Online TPP Program

#Question id: 3507

#Unit 11. Evolution and Behavior

Rank the following from most general to most specific:

A. gametic isolation

B. reproductive isolating mechanism

C. pollen-stigma incompatibility

D. prezygotic isolating mechanism
TLS Online TPP Program

#Question id: 3506

#Unit 11. Evolution and Behavior

An altruist provides help worth 9 units of fitness to a recipient, at a personal cost of 2 unit of fitness. As per kin-selection theory, the minimum value of genetic relatedness between the actors and the recipients that is necessary to maintain altruism in the population is