If a plant is exposed to a toxin that made the thylakoid membranes permeable to hydrogen ions, predict the impact of the toxin on each of the following:
A. The hydrogen ion gradient across the
thylakoid membrane
B. The oxidation of NADPH to NADP+
C. The pH in the lumen of the thylakoid
D. The production of carbohydrate in the
Calvin cycle
E. The amount of oxygen evolved in the lightdependent
reactions
A
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The visual proof that chromosomes exchange pieces of information during crossing over was provided by __________
A. Bateson and Punnett B. Morgan and Bridges C. Creighton and McClintock D. Watson and Crick
Which one of the following is NOT a symptom of PKU?
A. Unusually light colored hair and skin B. "Musty" body odor C. Jerky arm and leg movements D. Mental retardation E. Vomiting and digestive upset
Which of the following is not a function of activated complement proteins?
a. lysis of pathogens b. enhancing inflammation c. coating pathogens to enhance phagocytosis d. attraction of white blood cells to infection sites e. decreasing capillary permeability to minimize edema
Scientists attempted for many years to conduct nuclear transplants but failed. However, geneticists had success in cloning a sheep. They were successful because they
A. utilized a new micro pipette technique. B. replicated the blastomeres before insertion. C. treated the nucleus with sheep plasma before nuclear insertion. D. delayed transcription in the blastomeres. E. picked a cell very early in development.