The classic experiments conducted by Meselson and Stahl demonstrated that DNA replication is accomplished by employing a ________________ mechanism
(a) continuous
(b) semiconservative
(c) dispersive
(d) conservative
(b)
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Which is the correct match for Blood Type and Antibody?
a) Type A has A antibodies b) Type B has B antibodies c) Type O has both A and B antibodies d) Type AB has both A and B antibodies
Which of the following bonds explains the cohesion of water molecules in the cohesion-tension mechanism?
A) Disulfide B) Peptide C) Hydrogen D) Ionic E) Covalent
Figure 8.3
Answer the following questions about Griffith's experiments involving Streptococcus pneumoniae.
If an injection to the mouse contains live S strain Streptococcus pneumonia, ____.
A. the mouse will develop fatal pneumonia. B. live R strain will be detected in the mouse's blood C. the mouse will remain healthy. D. no live S strain will be detected in the mouse's blood E. the live S strain bacteria will lose their pathogenicity
The most important virulence factor of Vibrio cholerae is
A) the presence of two axial flagella. B) the fact that it is oxidase positive. C) its ability to survive in fresh water. D) its ability to produce a potent exotoxin. E) its ability to live in estuarine and marine environments all over the world.