TLS Online TPP Program

#Question id: 1253


Following statements are regarding to the wnt signalling.

A. Wnt proteins interact with several cell-surface proteins and activate multiple downstream signal transduction pathways. The principal signaling receptor for Wnt proteins is Frizzled (Fz), which contains seven transmembrane α helices.

B. The palmitate attached to the Wnt protein binds to a specific site on the Fz intracellular domain and stabilizes the Wnt-Fz complex.

C. “canonical” Wnt signaling pathway uses a second transmembrane protein, LRP, that associates with Frizzled in a Wnt signal– dependent manner.

D. In the resting state, two kinases in the complex, casein kinase 1 (CK1) and GSK3, sequentially phosphorylate β-catenin on multiple tyrosine residues.

Which of the following statements are correct?

#Unit 4. Cell Communication and Cell Signaling
  1. A and C

  2. A and B

  3. B and D

  4. A, B and D

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TLS Online TPP Program

#Question id: 12095

#Unit 10. Ecological Principles

It is now thought that the atmosphere of the primitive Earth was composed largely of carbon dioxide, nitrogen, and water vapor. The composition of certain iron-containing minerals suggests that the carbon dioxide began to be replaced by oxygen about 2 billion years ago.   Which of the following is the best explanation for the change in atmospheric composition?

TLS Online TPP Program

#Question id: 436

#Unit 1. Molecules and their Interaction Relevant to Biology

A chemical reaction with a negative enthalpy change and a negative entropy change

TLS Online TPP Program

#Question id: 5226

#Unit 11. Evolution and Behavior

Which of the following has the largest genome and the fewest genes per million base pairs?

TLS Online TPP Program

#Question id: 4710

#Unit 11. Evolution and Behavior

The horizontal axis of the cladogram depicted below is a timeline that extends from 100,000 years ago to the present; the vertical axis represents nothing in particular. The labeled branch points on the tree (V-Z) represent various common ancestors. Let's say that only since 50,000 years ago has there been enough variation between the lineages depicted here to separate them into distinct species, and only the tips of the lineages on this tree represent distinct species.

 Which pair of scientists below would probably have agreed with the process that is depicted by this tree?

TLS Online TPP Program

#Question id: 23661

#Unit 13. Methods in Biology

Which is(are) appropriate for use as a labeled probe(s) to screen a DNA library?