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TLS Online TPP Program

#Question id: 3396

The Galapagos finches were an important clue to Darwin's thinking about the origin of species. These finches are believed to have descended from a single ancestral species that colonized the Galapagos archipelago, America, over a short period of time. The Galapagos finches differ in their beak shape and size. Different species feed on seeds that vary in size and hardness. Which of the following is the most likely explanation for these patterns?

#Unit 11. Evolution and Behavior

  1. The finches represent an example of directional trend in beak size from small to big.

  2. Beak shapes changed in response to different seed types and these changes were inherited by subsequent generations.

  3. The ancestral finch already had all the beak variations and different lineages formed that were specialized to eat different seed

  4. The finches represent an example of adaptive radiation in which beak variation was generated by mutation followed by selection by different seed types.

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TLS Online TPP Program

#Question id: 23891

#Unit 13. Methods in Biology

Which of the following is (are) used both in the polymerase chain reaction (PCR) and in DNA sequencing?
a. single-stranded DNA primers
b. deoxynucleotide triphosphates (dNTPs)
c. dideoxynucleotide triphosphates (ddNTPs)
d. DNA polymerase
TLS Online TPP Program

#Question id: 14486

#Unit 13. Methods in Biology

There are two bags, one of which contains 5 red and 7 white balls and the other 3 red and 12 white balls. A ball is to be drawn from one or other of the two bags, find the chance of drawing a red ball.
TLS Online TPP Program

#Question id: 11131

#Unit 7. System Physiology – Animal

Which statement concerning the generation of an action potential is correct?
TLS Online TPP Program

#Question id: 1639

#Unit 4. Cell Communication and Cell Signaling

T-cell surface receptors for antigen partly recognize:
TLS Online TPP Program

#Question id: 4163

#Unit 3. Fundamental Processes

The net effect of all amino acid tRNA synthetases binding to a tRNA is to position the __ of tRNA in the active site.