Practice Questions

TLS Online TPP Program

#Question id: 4976

Which of these is the most likely explanation for the existence of dicynodont fossils on modern-day Antarctica?

#Unit 11. Evolution and Behavior

They arrived there aboard ʺraftsʺ of vegetation, and quickly adapted to the bitterly cold climate.
Earthʹs polar regions were once so warm (especially immediately after the ʺsnowball Earth periodʺ) that reptiles and mammal-like reptiles flourished there.
The landmass that is now the Antarctic continent was formerly located at a more-northerly position, and was also united to other landmasses.
Dicynodonts originated on the island continent of Antarctica and went extinct as the continent migrated to its current position at the South Pole.

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TLS Online TPP Program

#Question id: 13032

#Unit 13. Methods in Biology

In SDS-PAGE, protein sample is first treated with detergent sodium dodecyl sulfate (SDS), in order to

TLS Online TPP Program

#Question id: 13033

#Unit 13. Methods in Biology

The sample is then fractionated by electrophoresis through a _______. As all the proteins now have an _______ to mass ratio, they are separated on the basis of their _____.

TLS Online TPP Program

#Question id: 13034

#Unit 13. Methods in Biology

Which the following statements is/are true about the stacking gel?

i. The stacking gel solution contains acrylamide.

ii. It is on the top of the separating gel.

iii. It is used to dilute the protein sample before it enters the main separating gel.

iv. It is into this gel that the wells are formed and the proteins loaded.

TLS Online TPP Program

#Question id: 13035

#Unit 13. Methods in Biology

Each band on the gel represents a different protein (or protein subunit); _____ proteins move through the gel more _____ than_____ proteins and therefore are found nearer the _____ of the gel.

TLS Online TPP Program

#Question id: 13036

#Unit 13. Methods in Biology

In isoelectric focusing the protein will move until

TLS Online TPP Program

#Question id: 13037

#Unit 13. Methods in Biology

Which of the following proteins will be most far away from the positively charged electrode during isoelectric focusing in a buffer with pH of 5?