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Listen to an Academic Talk Test #052
Listen to an Academic Talk
1. What is the talk mainly about?
A) The hunting strategies of deep-sea fish
B) A type of light produced by living things
C) The chemical process of generating heat
D) Methods for conducting medical research
2. According to the speaker, why is bioluminescence called a "cold light"?
A) It is found in cold environments like the deep sea.
B) It feels cold to the touch.
C) It is not efficient at producing energy.
D) It produces very little heat.
3. What can be inferred about the deep ocean environment?
A) It has very few sources of natural light.
B) It is where bioluminescence first evolved.
C) Its temperature is too cold for most fish.
D) It is home to many types of fireflies.
4. Why does the speaker mention medical research?
A) To show how a natural process can be used by humans
B) To argue for more funding for science
C) To explain the mating habits of fireflies
D) To contrast bioluminescence with other light sources
Lecturer: Let's talk about one of nature's most fascinating displays: bioluminescence.
This is the production and emission of light by a living organism. It's essentially a 'cold light,' meaning less than 20 percent of the light generates thermal radiation, or heat. So, how is it used? Well, it serves many purposes.
For example, fireflies use flashes of light to attract mates. In the deep ocean, where there's no sunlight, the anglerfish uses a glowing lure to attract unsuspecting prey right to its mouth. It's an incredibly effective hunting strategy.
Beyond nature, scientists have harnessed this process. For instance, the genes responsible for bioluminescence can be inserted into other cells, like cancer cells, allowing researchers to visually track their movement and growth in real-time.
This has become an invaluable tool in medical research.
This is the production and emission of light by a living organism. It's essentially a 'cold light,' meaning less than 20 percent of the light generates thermal radiation, or heat. So, how is it used? Well, it serves many purposes.
For example, fireflies use flashes of light to attract mates. In the deep ocean, where there's no sunlight, the anglerfish uses a glowing lure to attract unsuspecting prey right to its mouth. It's an incredibly effective hunting strategy.
Beyond nature, scientists have harnessed this process. For instance, the genes responsible for bioluminescence can be inserted into other cells, like cancer cells, allowing researchers to visually track their movement and growth in real-time.
This has become an invaluable tool in medical research.
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