Four of the following statements about the H5N1 virus are true. Which one is false?
a. It is symptomless in pigs.
b. It has a high mortality rate in humans.
c. It cannot infect birds.
d. It moves poorly from human to human.
e. It can move between pigs.
ANSWER: c
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Indicate whether this statement is true or false.
The two main functions of the lymphatic system are
A) coagulating blood and fighting infections. B) producing hormones that regulate the immune system and coagulating blood. C) producing hormones that regulate the immune system and fighting infections. D) returning tissue fluid to the circulatory system and fighting infections.
Although each of the following has a better chance of influencing gene frequencies in small populations than in large populations, which one most consistently requires a small population as a precondition for its occurrence?
A) mutation B) nonrandom mating C) genetic drift D) natural selection E) gene flow
According to the central dogma, the process by which information in an RNA molecule is used to direct the synthesis of a polypeptide is called
A) transduction. B) translation. C) transcription. D) transition. E) transversion.