- What is the lecture mainly about?
- A. Methods of analyzing toxic proteins in snake venom
- B. Insights about snake evolution provided by venom analysis
- C. How snake venom differs from lizard venom
- D. Why colubrids are considered nonvenomous snakes
- Why does the professor review information about the classification of snakes that students probably learned in previous courses?
- A. To determine whether the students have enrolled in the appropriate course
- B. To stress the usefulness of the classification system for students
- C. To present assumptions that have recently been challenged
- D. To give an example of a method that she will explain in greater detail
- According to the professor, what is a major weakness of the classification system that is based on animals’ physical characteristics?
- A. It can show the relationships only among a small number of animal species.
- B. It requires technology that is not widely available.
- C. It cannot account for characteristics that first appeared in the recent geologic past.
- D. It cannot determine whether similar characteristics developed in similar ways.
- According to the professor, in what way do colubrid snakes differ from other venomous snakes?
- A. Colubrids did not evolve from lizards.
- B. Colubrids do not use venom to catch their prey.
- C. The front teeth of colubrids are much larger than those of other venomous snakes.
- D. Colubrids produce a much stronger type of venom than other venomous snakes do.
- Why does the professor mention the brown tree snake?
- A. To support a hypothesis about the evolution of constrictor snakes
- B. To support a hypothesis that venomous snakes evolved from constrictor snakes
- C. To give an example of a snake species that was never venomous
- D. To give an example of a type of snake that can change its color
- What is the professor’s attitude toward the results from medical research on snake venom proteins?
- A. She is enthusiastic about the drugs that have been tested to date.
- B. She is concerned about the side effects of drugs created from snake venom proteins.
- C. She doubts that the DNA database will be useful in developing new drugs.
- D. She thinks it is too early to tell how successful the research will be.
B C D B A D