L3
讲座
1. What is the purpose of the lecture?
To describe two types of symbiosis found among ocean animals
To describe a useful property of a bacterium
To explain how certain bacteria can transfer genes from animals to plants
To explain how Vibrio fischeri glow in the dark
2. Why does the professor mention termite digestion and the synthesis of vitamin K in humans?
To contrast two very different types of symbiosis
To explain that symbiosis is not limited to sea creatures
To stress how complex humans are compared to termites
To emphasize that symbiotic relationships are quite common
3. How does the symbiotic relationship with Vibrio fischeri benefit the angler fish?
It helps the angler fish to disguise itself from predators.
It helps the angler fish to see in the dark.
It helps the angler fish to attract prey.
It helps the angler fish to digest food.
4. According to the professor, how does the bobtail squid avoid predators?
It uses an internal organ to illuminate itself.
It uses a symbiotic bacterium to change its color during the day.
It only comes out on moonless nights.
It stays in shallow areas where its predators cannot swim.
5. What is the connection between Vibrio fischeri and transgenic technology?
Vibrio fischeir’s ability to live in symbiosis with other creatures inspired transgenic
technology.
Transgenic technology makes it possible to study the symbiosis of Vibrio fischeri with other organisms.
Genes from Vibrio fischeri were the first to be used in experiments using transgenic technology.
Genes from Vibrio fischeri can confirm the success of experiments that use transgenic technology.
6. Why does the professor say this:
To remind students about a previous lecture about termites
To indicate how important it is for researchers to work with microbes
To reinforce the point she just made about symbiosis
To draw the students’ attention to a new topic
