A circulatory system that keeps blood confined within vessels after leaving the heart is
A. a closed circulatory system.
B. a gastrovascular cavity.
C. an open circulatory system.
D. an incomplete circulatory system.
E. a complete circulatory system.
Answer: A. a closed circulatory system.
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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.
Define epistasis and give an example
What will be an ideal response?
Transcription starts at a region of DNA called
a(n)
a. sequencer. b. promoter. c. activator. d. terminator. e. transcriber
The oxygen production measured in the experiments of this exercise
a. is a consequence of the breakdown of hydrogen peroxide. b. is an index of enzyme activity. c. may depend on pH, temperature, or enzyme concentration. d. is all of the above.