Which of the following developed a set of postulates for determining whether a particular disease is caused by a particular pathogen?
A. John Snow
B. Robert Koch
C. Joseph Lister
D. Louis Pasteur
Ans: B. Robert Koch
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Which regulatory mechanism does NOT depend on a conformational change in protein/enzyme structure to change activity?
A) attenuation B) catabolite repression C) feedback inhibition D) negative control
Air enters human lungs from the mouth by passing through the ________.
A. posterior air sacs B. trachea C. spiracles D. esophagus E. nasal cavities
You collect and measure samples of ice and surrounding ice water from a stream in the winter. You find that you collected the same number of water molecules in each form. The volume of the ice samples are larger than the ice water samples. This is a result of
A. the ionic bonds between the water molecules being unstable and constantly forming and breaking that increases the volume and decreases the density of the ice. B. the covalent bonds between the water molecules being unstable and constantly forming and breaking that increases the volume and decreases the density of the ice. C. the covalent bonds between the water molecules being in a fixed position that increases the volume and decreases the density of the ice. D. the hydrogen bonds between the water molecules being unstable and constantly forming and breaking that increases the volume and decreases the density of the ice. E. the hydrogen bonds between the water molecules being in a fixed position that increases the volume and decreases the density of the ice.
CAM plants conserve water by ________
A) opening their stomata only at night B) incorporating CO2 into RuBP C) keeping their stomata closed at night D) running the Calvin cycle at night