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TLS Online TPP Program

#Question id: 652

Two proteins, X and Y, bind to the same ligand, A, with the binding curves shown below. Which of the statement is correct for the graph analysing two proteins?

#Unit 1. Molecules and their Interaction Relevant to Biology

  1. For X, Kd is 1 micromole; for Y, Kd is 2 micromole & Because Y is half-saturated at a lower [B], it has a higher affinity for the ligand.

  2. For X, Kd is 3 micromole; for Y, Kd is 6 micromole & Because X is half-saturated at a lower [B], it has a higher affinity for the ligand.

  3. For X, Kd is 6 micromole; for Y, Kd is 2 micromole & Because Y is half-saturated at a lower [A], it has a higher affinity for the ligand.

  4. For X, Kd is 2 micromoles; for Y, Kd is 6 micromole & Because X is half-saturated at a lower [A], it has a higher affinity for the ligand.

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TLS Online TPP Program

#Question id: 4969

#Unit 11. Evolution and Behavior

The snowball Earth hypothesis provides a possible explanation for the
TLS Online TPP Program

#Question id: 4966

#Unit 11. Evolution and Behavior

If it were possible to conduct sophisticated microscopic and chemical analyses of microfossils found in 3.2-billion-year-old stromatolites, then within such microfossils, one should be surprised to observe evidence of:

I. double-stranded DNA

II. a nuclear envelope

III. a nucleoid

IV. a nucleolus

V. nucleic acids
TLS Online TPP Program

#Question id: 4960

#Unit 11. Evolution and Behavior

Letʹs say that a hypothetical submersible robot was used to collect samples of sedimentary rock from the sea floor along the section illustrated. The robot moved back and forth along the transect, collecting first from site A, then site III, then site B, then site II, and lastly site D. Assuming that sedimentation has occurred at a constant rate along the transect over the past million years, rearrange the sites mentioned above on the basis of the thickness of the sediments overlying the igneous rock, from thickest to thinnest.
TLS Online TPP Program

#Question id: 4959

#Unit 11. Evolution and Behavior

If a fossil is encased in a stratum of sedimentary rock without any strata of igneous rock (e.g., lava, volcanic ash) nearby, then it should be
TLS Online TPP Program

#Question id: 4564

#Unit 11. Evolution and Behavior

Who would have proposed that the boundaries between each stratum mark the occurrence of different localized floods?
TLS Online TPP Program

#Question id: 4565

#Unit 11. Evolution and Behavior

Darwinʹs mechanism of natural selection required long time spans in order to modify species. From whom did Darwin get the concept of Earthʹs ancient age?