The Calvin cycle makes direct use of ________ to make ________
A) light energy and CO2... sugar
B) CO2, ATP, and NADPH... sugar and O2
C) light energy, CO2, and water... sugar and O2
D) CO2, ATP, and NADPH... sugar
D
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In the context of chemical evolution, DNA's structure is interesting because it suggests a possible copying mechanism. What about DNA's structure facilitates copying?
A) It has the same number of purines and pyrimidines. B) The nitrogenous bases are located on the inside of the double helix. C) The strands of the double helix are complementary. D) DNA always goes from 5 prime to 3 prime.
Enzymes function by
(a) being consumed (used up) in the reaction. (b) lowering the activation energy of a reaction. (c) combining with otherwise toxic substances in the cell. (d) adding heat to the cell to speed up the reaction
Which of the following is NOT accurate concerning
ionization? a. When one atom loses electrons, another must gain electrons. b. When an atom loses an electron, it becomes negatively charged. c. Ionic bonds form between ionized atoms. d. In the compound NaCl, Na loses an electron to become positive. e. In an ion, the number of protons and electrons is unequal.
Cholera is spread by contaminated food and water. The bacterium kills by changing the permeability of the cells of the large intestine. Which therapy would give the best chance of saving a person with cholera, given the information in this chapter?
A) radiation B) surgery C) chemotherapy D) fluid replacement