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TLS Online TPP Program

#Question id: 2588

Which of the following statement is correct regarding attachment of microtubule to the kinetochore?

#Unit 2. Cellular Organization

  1. Once a kinetochore is attached laterally or terminally to a microtubule, dynein-dynactin associates with the kinetochore to move the duplicated chromosome down the microtubule toward the spindle pole. This movement eventually results in an end-on attachment of the microtubule to one kinetochore.

  2. Once a kinetochore is attached laterally or terminally to a microtubule, kinesin associates with the kinetochore to move the duplicated chromosome down the microtubule toward the spindle pole. This movement eventually results in an end-on attachment of the microtubule to one kinetochore.

  3. Once a kinetochore is attached laterally or terminally to a microtubule, myosin associates with the kinetochore to move the duplicated chromosome down the microtubule toward the spindle pole. This movement eventually results in an end-on attachment of the microtubule to one kinetochore.

  4. Kinesin-13 provides the strongest force pulling the chromosome pair toward the more distant pole. This movement requires simultaneous shortening of the microtubule, which is enhanced by kinetochore-localized dynein-dynactin.

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TLS Online TPP Program

#Question id: 4620

#Unit 11. Evolution and Behavior

The upper forelimbs of humans and bats have fairly similar skeletal structures, whereas the corresponding bones in whales have very different shapes and proportions. However, genetic data suggest that all three kinds of organisms diverged from a common ancestor at about the same time. Which of the following is the most likely explanation for these data?
TLS Online TPP Program

#Question id: 4621

#Unit 11. Evolution and Behavior

DNA sequences in many human genes are very similar to the sequences of corresponding genes in chimpanzees. The most likely explanation for this result is that
TLS Online TPP Program

#Question id: 4622

#Unit 11. Evolution and Behavior

 Catastrophism, meaning the regular occurrence of geological or meteorological disturbances (catastrophes), was Cuvierʹs attempt to explain the existence of
TLS Online TPP Program

#Question id: 4623

#Unit 11. Evolution and Behavior

 Which of the events described below agrees with the idea of catastrophism?
TLS Online TPP Program

#Question id: 4624

#Unit 11. Evolution and Behavior

What was the prevailing notion prior to the time of Lyell and Darwin?
TLS Online TPP Program

#Question id: 4625

#Unit 11. Evolution and Behavior

During a study session about evolution, one of your fellow students remarks, ʺThe giraffe stretched its neck while reaching for higher leaves; its offspring inherited longer necks as a result.ʺ Which statement is most likely to be helpful in correcting this studentʹs misconception?