生物学 TPO33-L3 Notothenioids

TPO33-L3

Notothenioids

Listen to part of a lecture in a biology class.

 


 

 

  1. What is the lecture mainly about?
  • A. How various proteins function in notothenioids.
  • B. How notothenioids became the dominant type of fish in the Southern Ocean.
  • C. An example that contradicts the theory of adaptive radiation.
  • D. Changes in ocean habitats caused by continental drift.

 

  1. Why does the professor mention that coral reefs support more than 4,000 species of fish?
  • A. To find out what students know about tropical fish.
  • B. To contrast two types of ocean environments.
  • C. To imply that there may be species in the Southern Ocean that have not been discovered yet.
  • D. To imply that there may be fossil evidence of coral reefs in the Southern Ocean.

 

  1. What characteristic of notothenioids helps them survive in subfreezing temperatures?
  • A. They maintain an unusually high body temperature.
  • B. A special tissue in their eyes enables them to see through ice.
  • C. Special proteins make their blood circulate too fast to freeze.
  • D. Ice crystals in their bodies are prevented from growing large enough to harm them.

 

  1. Why did the antifreeze protein initially give no special advantage to the earliest notothenioids?
  • A. Many other types of fish had the same protein.
  • B. The notothenioids were not living in subfreezing temperatures.
  • C. The effect of the antifreeze protein was neutralized by other proteins.
  • D. The antifreeze protein functioned only in the smallest notothenioids.

 

  1. According to the professor, what factors led to the rapid distribution of notothenioids throughout the Southern Ocean?
    [CHOOSE 2 ANSWERS]
  • A. A genetic mutation occurred in the DNA of the earliest notothenioid.
  • B. There was an increase in competition for food in temperate waters.
  • C. Antarctica broke off and drifted away from the South American continent.
  • D. The waters around Antarctica temporarily warmed up.

 

  1. According to the professor, what happened to notothenioids that migrated to different areas of the Southern Ocean?
  • A. They evolved into a wide variety of notothenioid species.
  • B. They developed the ability to tolerate a wide range of temperatures.
  • C. Some of them became extinct because of new predators.
  • D. Some of them developed additional antifreeze proteins.


答案:
B B D B AC A

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