生物学  TPO39-L4 Potential Alternative Source

TPO39-L4

Potential Alternative Source

Listen to part of a lecture in a biology class.

 



  1. What is the discussion mainly about?
  • A. Advantages of cellulose over traditional sources of fuel.
  • B. A recent study about microorganisms that process cellulose.
  • C. Some newly discovered characteristics of cellulose.
  • D. Challenges involved in converting cellulose into fuel.

 

  1. According to the speakers, why is cellulose such a significant potential source of energy?
  • A. Because it is so abundant in nature.
  • B. Because it is so easily created in a lab.
  • C. Because its enzymes have so many uses.
  • D. Because it can be processed in just a few steps.

 

  1. What is the professor’s opinion about corn-based ethanol?
  • A. She thinks using it in motor vehicles may harm the environment.
  • B. She thinks it is not an energy-efficient alternative to gasoline.
  • C. She thinks it will eventually become cheaper to produce.
  • D. She thinks researchers should invest more in its development.

 

  1. The professor describes the current method for producing cellulose ethanol. What are the two important steps she mentions?
    [CHOOSE 2 ANSWERS]
  • A. Yeast is added to cellulose to create an enzyme.
  • B. An enzyme breaks down cellulose into sugars.
  • C. Microorganisms ferment sugars into alcohol.
  • D. Ethanol is extracted from certain microorganisms.

 

  1. What does the professor imply about a superbug?
    [CHOOSE 2 ANSWERS]
  • A. It will be an altered version of a naturally occurring organism.
  • B. It was discovered as a result of looking for new sources of cellulose.
  • C. It may contribute to the development of an efficient way to produce ethanol
  • D. It may produce many kinds of alternative fuels.

 

  1. Why does the professor says this: 🎧
  • A. To emphasize the necessity of working to preserve rare species.
  • B. To suggest that the company will never find what it is looking for.
  • C. To emphasize that bacteria that break down cellulose are too rare to be useful.
  • D. To indicate that she endorses the company’s strategy.


答案:
D A B BC AC D

发表评论

电子邮件地址不会被公开。 必填项已用*标注