Which gene is correctly matched with its evolutionary significance?
A. The gremlin gene - evolution of the simple eye.
B. The Hox genes - evolution of body plans.
C. The Pax6 - evolution of skull shape.
D. The BMP4 gene - evolution of lungs.
Answer: B
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The significance of Fred Griffith's experiment in which he used two strains of Streptococcus pneumoniae is that
a. the semiconservative nature of DNA replication was finally demonstrated. b. it demonstrated that harmless bacterial cells had become permanently transformed through a change in the bacterial hereditary system. c. it confirmed that each cell of a given species contains the same amount of DNA. d. it demonstrated that radioactively labeled bacteriophages transfer their DNA but not their protein coats to their host bacteria. e. it demonstrated that mice can change the hereditary content of bacteria.
In which way does sulfur enter the atmosphere?
a. Volcanic activity b. Marine food webs c. Living plants d. Animal waste
Which of these is not a characteristic of an open circulatory system?
A. Blood is enclosed within blood vessels. B. It is found in mollusks and arthropods. C. It contains hemolymph. D. There is no distinction between blood and interstitial fluid or lymph.
A sample has been taken from an infected surface wound. Which are the most appropriate incubation conditions?
a. 30oC in an incubator b. 30oC in an anaerobe jar c. 37oC in an incubator d. 37oC in an anaerobe jar