The photosynthetic production of one molecule of glucose requires ________ molecule(s) of NADPH.
A. 6
B. 24
C. 12
D. 18
Answer: C
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For a chemical bond to form:
A. the process must be exothermic, releasing energy upon bond formation. B. the total energy of the system must be higher in the bonded state than in the nonbonded state. C. one of the atoms must be more electronegative than the other. D. the process must consume more energy than it takes to break the bond. E. the temperature of the system must be low, slowing the molecular motion of the atoms.
In humans, the most frequently seen autosomal aneuploid is
A) monosomy 21. B) trisomy 13. C) trisomy 21. D) tetraploidy.
Monoclonal antibodies:a
have been linked as causative agents in some types of cancer. b. are only produced by harvesting B cells from mice exposed to particular antigens. c. include hCG, a component of commonly used home pregnancy tests. d. are very specific for their target antigen, but are somewhat difficult to purify. e. are produced by millions of genes.
Major risk factors for lung cancer include:
A) female sex and age over 40 years. B) frequent respiratory infections and asthma. C) cigarette smoking and exposure to asbestos. D) chewing tobacco use and a history of allergies.