Which of the following are among the Archaea that have been cultured in the laboratory?
a. Crenarchaeota and Korarchaeota
b. Crenarchaeota and Euryarchaeota
c. Nanoarchaeota and Korarchaeota
d. Euryarchaeota and Nanoarchaeota
Ans: b. Crenarchaeota and Euryarchaeota
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Why do obligate symbionts often contain lower G+C content when compared to free-living organisms?
A) Ancestral symbionts had low GC content genomes by chance, and these low GC content genomes are passed onto their progeny. B) Free-living organisms must have a more stable genome to survive; low G+C content organisms are often selected against in nature. C) Replicating high G+C content genomes requires several additional enzymes, to break apart the strong triple bonds formed from GC pairs, which are rarely found in symbionts with relatively small genome sizes. D) Symbionts usually do not have as many DNA repair mechanisms as free-living organisms, and two common spontaneous mutations change GC pairs into AT pairs.
Which is true about guncotton?
a. it is a highly explosive derivative of cholesterol. b. it is used to make gunpowder. c. it is less stable than gunpowder d. it has a higher activation energy for a reaction with oxygen than gunpowder e. more than one of these is correct
Which two factors determine the virulence of a particular pathogen?
a. its ability to cause damage to the host tissues b. the degree of immune system involvement in the infection c. the overall health of the infected person d. the number in the inoculating dose e. its ability to establish itself in the host
In which of the following conditions would you not see an increase in alpha-fetoprotein?
A. Pregnancy B. Hepatocellular carcinoma C. Hepatitis D. Hypercholesteremia